DOCSLIB.ORG

Picture Identification Guide for Polished Stones and Tumbled Rocks Provided By

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Picture Identification Guide for Polished Stones and Tumbled Rocks Provided By Picture Identification Guide for Polished Stones and Tumbled Rocks Provided by Amazonite Coral, Agatized Lepidolite Red Jasper Amazonite is a green microcline feldspar. It is A rare find is fossil coral that has been replaced by Lepidolite is a variety of mica that occurs in a Jasper is an opaque chalcedony and red is one of its named after the Amazon River of South America, agate - or agatized. This type of fossilization often spectrum of colors that range from pink to deep most common colors. This red jasper from South where the first commercial deposits were found. preserves the structure of the coral individual or lavender. The stones shown here are tumbled Africa has a fire-engine red color that in some The stones shown here are a rich green Amazonite colony. The result can be a beautiful stone that can quartz pebbles that have enough lepidolite stones is interrupted by a white to transparent quartz that was mined in Russia. be polished to display cross and lateral sections inclusions to yield pink and lavender gemstones. vein. It often accepts an exceptionally high polish. through the coral fossil. Apache Tears Crackle Quartz Lilac Amethyst Rhodonite - Pink Apache Tears are round nodules of obsidian that "Crackle Quartz" is a name used for quartz Amethyst is a purple variety of crystalline quartz that Rhodonite is a metamorphic manganese mineral can be transparent through translucent. When it has polish to a beautiful jet black color. If you hold them specimens that have been heat treated and then that is well known for its beautiful pink color. It is dyed to change their color. The heat treatment a soft purple color it is often called "lilac amethyst". up to the light you will see that they are a translucent often found as nodules that are cut by abundant produces fractures in the stone that facilitate the The stones shown here were produced from material to transparent glass. These polished Apache Tears black veins of other manganese minerals. The penetration of dyes. mined in South Africa. were produced from a material found in Arizona material used to produce these stones was mined (USA). in Canada. Apricot Agate Dalmatian Stone Lodestone Rhodonite - Raspberry Apricot Agate is a banded agate that is named for its Dalmatian Stone is white to gray jasper with black Lodestone has amazed people for thousands of Raspberry rhodonite is a bright pink variety of the apricot pink or orange color. It is a beautiful material spots. It is given that name because white years because it is a natural magnet. When manganese mineral, rhodonite. It is a metamorphic specimens have a color pattern similar to a with bands of whites, creams, yellows, oranges and suspended on a string, it will orient itself with Earth's mineral with a gemmy pink color that is often Dalmatian dog. Dalmatian Stone is often dyed a pinks. The stones shown here were produced from magnetic field. It has a silver metallic luster and is a interrupted by veins of black manganese oxide. The variety of colors. agate mined in Botswana (Africa). variety of the iron ore magnetite. These specimens specimens shown here were found in Madagascar. were found in the United States. Banded Amethyst Dumortierite Malachite Rose Quartz Amethyst is the name given to transparent to Dumortierite is a bright blue, dark blue or Malachite is a green copper carbonate mineral. It Rose quartz is a transparent to translucent variety translucent purple quartz. It often forms in greenish-blue mineral that is occasionally found in often displays swirled and banded patterns in of crystalline quartz with a soft pink color. It takes alternating bands with white to clear quartz. The metamorphic rocks. It can be polished to a high shades of light through dark green. It is a very heavy a very high polish and is an exceptionally popular resulting material is called Banded Amethyst or sometimes Chevron Amethyst. The Banded luster and is one of just a few blue minerals that are material because of its high copper content. These semiprecious stone. The material used to produce Amethyst used to produce these stones was mined hard enough to be used as a gemstone. The stones stones were produced from malachite mined in Zaire these stones was mined in Namibia (Africa). in Namibia (Africa). shown here were produced from material mined in (Africa). Mozambique (Africa). Banded Carnelian Dyed Agate Montana Moss Agate Ruby in Zoisite Carnelian is a translucent orange to red or brown Agate is a variety of chalcedony that can be Montana Moss is a transparent to translucent agate Zoisite is a mineral that is rarely found in agate. It often forms in alternating bands with white extremely colorful but usually is not. It is slightly with brown and black mossy inclusions. The base metamorphic rocks. Even more rarely it contains chalcedony. The result is known as Banded porous, with some bands and zones being more color ranges from clear through milky to amber bright red corundum crystals (rubies). This bright Carnelian. These stones were produced from an porous than others. When heat treated and exposed orange to pink material mined in Botswana (Africa). to dye, the porous zones absorb more dye than the brown. It is named after the State of Montana where green zoisite mined in Tanzania (Africa) contains less porous, producing a stone that is banded with it is found at many locations and is a popular rough occasional red rubies a few millimeters in diameter. various color intensities. with lapidaries. Bloodstone Eye Agate Mookaite Snowflake Obsidian Bloodstone, also known as heliotrope, is a green "Eye agates" are rare agate specimens that have Mookaite is silicified radiolarian siltstone that is Obsidian is a natural volcanic glass that can be jasper splashed with small drops of red. The red perfectly circular markings or "eyes". These are found in Western Australia. Many specimens of polished to a very high luster. Some stones of actually three-dimensional features that extend into Mookaite can accept a very high polish. It is widely drops remind many people of blood and that is the obsidian contain white crystals of the mineral the stone in the shape of a hemisphere. Sometimes known for its spectacular contrasting color patterns source of the name Bloodstone. It has been a cristobalite. When polished these stones produce they have concentric or "bull's eye" color zones. of yellows, creams, reds and maroons. popular stone since Biblical times. The Bloodstone Lake Superior and Botswana agates frequently a gemstone known as snowflake obsidian. shown here was produced from material mined in display eyes. India. Blue Chalcedony Fluorite Ocean Jasper Sodalite There are very few blue gemstones. Occasionally Fluorite occurs in a variety of colors that frequently Ocean Jasper, sometimes called "orbicular jasper," Blue rocks and minerals are rare and that is what the variety of quartz known as chalcedony occurs in includes purple, green, yellow, blue and clear, that is a silicified rhyolite or tuff that contains "eyes" makes sodalite an interesting mineral. It is an a blue color, such as this blue material mined in are often banded. Although it is beautiful it is not formed from radial quartz and feldspar crystals. It igneous mineral named for its sodium content. It Namibia (Africa). especially well suited for use in jewelry and certain occurs in a variety of colors, but green, yellow, typically occurs in a range of blue hues but white crafts because it has a hardness of four and has white, pink and cream color patterns are very and pink colors are also common. perfect cleavage in four directions. common. The stones shown here were produced from material mined in Madagascar. Blue Lace Agate Granite Orange Quartz Sunstone Blue Lace Agate is the name given to a chalcedony Granite is an intrusive igneous rock that is composed Quartz naturally occurs in almost every color of the Sunstone is a plagioclase feldspar that contains that consists of alternating bands of white agate and of quartz and feldspar with minor amounts of micas, subtle blue to transparent agate. The result is a lacy amphiboles and other minerals. It can be pink, white spectrum. These colors are caused by impurities in abundant inclusions of platy minerals such as appearance that looks like blue lace. The Blue Lace or gray in color. Although the minerals in granite have the quartz crystal. This gemmy orange quartz in a mica or metals that sparkle in reflected light. This Agate shown here was produced from material found various hardness, it can easily be tumbled into beautiful "peach" color was produced from a mine in sparkling luster is known as aventurescence. These in Namibia (Africa). attractive stones. India. specimens of sunstone were mined in India. Botswana Agate Green Aventurine Petrified Wood Tigers Eye - Blue Botswana Agate is a name given to a banded agate Aventurine is a translucent quartz that contains in- Petrified wood forms when plant debris is buried and Tigers Eye receives its name from how reflected found in Botswana (Africa). This agate typically has wonderful white, gray and brown banding - sometimes clusions of platy minerals such as muscovite mica, then replaced by mineral material such as light forms a band that crosses the stone at a right with "eyes" - and takes a very high polish. hematite or goethite. The inclusions interact with chalcedony or opal. This often occurs when a forest angle to linear structures within the stone. Although light entering the stone to produce a glistening is buried under a volcanic ash fall. When polished the most popular Tigers Eye is golden to brown in known as "aventurescence." These light green these pieces of wood often display interesting grain color, it also occurs in other colors such as this deep stones were produced from material found in patterns that can sometimes be linked to a specific blue material found in South Africa.
Load more

Recommended publications
  • Summer 2006 Gems & Gemology Gem News
    EDITOR Brendan M. Laurs ([email protected]) CONTRIBUTING EDITORS Emmanuel Fritsch, IMN, University of Nantes, France ([email protected]) Henry A. Hänni, SSEF, Basel, Switzerland ([email protected]) Franck Notari, GIA GemTechLab, Geneva, Switzerland ([email protected]) Kenneth V. G. Scarratt, GIA Research, Bangkok, Thailand ([email protected]) COLORED STONES AND tusk fragments. The amber in figure 1 was eventually ORGANIC MATERIALS acquired by Barry Schenck of M. M. Schenck Jeweler Inc., Chattanooga, Tennessee, who recently loaned it to GIA for Alaskan amber. Few may think of Alaska as a source of examination. Mr. Schenck has counted more than 30 amber, but the Inuit people have long collected this organ- insects trapped inside the piece, as well as other organic ic gem from northern beach gravels between Harrison Bay materials, including an apparent seedpod. GIA subsequent- and Smith Bay on the Arctic Ocean. In Gemstones of ly purchased the piece (Collection no. 35840). North America (D. Van Nostrand Co., Princeton, NJ, Most of the insects were eye-visible, though others 1959), J. Sinkankas noted that locals refer to the amber as were best seen with magnification (up to 40×). Prominent auma, which translates as “live coal.” were a mosquito, spiders, beetles, gnats, ants, and possibly In 1943, an American soldier stationed in Alaska found a bee (see, e.g., figure 2). Other inclusions consisted of gas a 117.8 g chunk of amber (figure 1) while strolling along bubbles and debris that was probably associated with the the coast. Subsequent visits to the area yielded other trees from which the amber formed.
    [Show full text]
  • Rhodochrosite Gems Unstable Colouration of Padparadscha-Like
    Volume 36 / No. 4 / 2018 Effect of Blue Fluorescence on the Colour Appearance of Diamonds Rhodochrosite Gems The Hope Diamond Unstable Colouration of in London Padparadscha-like Sapphires Volume 36 / No. 4 / 2018 Cover photo: Rhodochrosite is prized as both mineral specimens and faceted stones, which are represented here by ‘The Snail’ (5.5 × 8.6 cm, COLUMNS from N’Chwaning, South Africa) and a 40.14 ct square-cut gemstone from the Sweet Home mine, Colorado, USA. For more on rhodochrosite, see What’s New 275 the article on pp. 332–345 of this issue. Specimens courtesy of Bill Larson J-Smart | SciAps Handheld (Pala International/The Collector, Fallbrook, California, USA); photo by LIBS Unit | SYNTHdetect XL | Ben DeCamp. Bursztynisko, The Amber Magazine | CIBJO 2018 Special Reports | De Beers Diamond ARTICLES Insight Report 2018 | Diamonds — Source to Use 2018 The Effect of Blue Fluorescence on the Colour 298 Proceedings | Gem Testing Appearance of Round-Brilliant-Cut Diamonds Laboratory (Jaipur, India) By Marleen Bouman, Ans Anthonis, John Chapman, Newsletter | IMA List of Gem Stefan Smans and Katrien De Corte Materials Updated | Journal of Jewellery Research | ‘The Curse Out of the Blue: The Hope Diamond in London 316 of the Hope Diamond’ Podcast | By Jack M. Ogden New Diamond Museum in Antwerp Rhodochrosite Gems: Properties and Provenance 332 278 By J. C. (Hanco) Zwaan, Regina Mertz-Kraus, Nathan D. Renfro, Shane F. McClure and Brendan M. Laurs Unstable Colouration of Padparadscha-like Sapphires 346 By Michael S. Krzemnicki, Alexander Klumb and Judith Braun 323 333 © DIVA, Antwerp Home of Diamonds Gem Notes 280 W.
    [Show full text]
  • Tiger's Eye Is Not a Pseudomorph Glenn Morita in the Early 1800’S, Mineralogists Recognized That Tiger’S Eye Was a Fibrous Variey of Quartz
    Minutes of the 05/20/03 Westside Board Meeting VP Stu Earnst opened the meeting at 7:31pm. Treasurer’s report read by Kathy Earnst. Minutes approved as published in the newsletter. Old business: Lease on Walker valley discussed. The expiration notice was sent but we are not sure who it went to. We do not see any obstacle to renewal as communication between the council and DNR are open and ongoing. Special thanks, to DNR representative, Laurie Bergvall and DNR staff for their time and effort in hearing our concerns and working towards mutually beneficial solutions on the Walker Valley issues. Sign production is on hold until the sign committee decides where and what the signs will say. We have decided that they will not be on the gate but separate from it. There will be a gate going up at Walker Valley but we will have access to that lock and it will probably be a combo type of thing that we can easily give to other rockhound clubs going there. Talked about the possibility of posing the combo on website but that will depend on the type of gate they put up and what ends up being possible with the mechanics of that gate. New business: Thank you from Bob Pattie and Ed Lehman to Bruce Himko and AAA Printing for donation of the paper. Thank you to Danny Vandenberg for providing sample Walker Valley Material to DNR to show the value of the material we are trying to preserve and enjoy. Bob Pattie is pursuing with the retrieval of our state seized funds through the unclaimed property process.
    [Show full text]
  • The Anjahamiary Pegmatite, Fort Dauphin Area, Madagascar
    The Anjahamiary pegmatite, Fort Dauphin area, Madagascar Federico Pezzotta* & Marc Jobin** * Museo Civico di Storia Naturale, Corso Venezia 55, I-20121 Milano, Italy. ** SOMEMA, BP 6018, Antananarivo 101, Madagascar. E-mail:<[email protected]> 21 February, 2003 INTRODUCTION Madagascar is among the most important areas in the world for the production, mainly in the past, of tourmaline (elbaite and liddicoatite) gemstones and mineral specimens. A large literature database documents the presence of a number of pegmatites rich in elbaite and liddicoatite. The pegmatites are mainly concentrated in central Madagascar, in a region including, from north to south, the areas of Tsiroanomandidy, Itasy, Antsirabe-Betafo, Ambositra, Ambatofinandrahana, Mandosonoro, Ikalamavony, Fenoarivo and Fianarantsoa (e.g. Pezzotta, 2001). In general, outside this large area, elbaite-liddicoatite-bearing pegmatites are rare and only minor discoveries have been made in the past. Nevertheless, some recent work made by the Malagasy company SOMEMEA, discovered a great potential for elbaite-liddicoatite gemstones and mineral specimens in a large, unusual pegmatite (the Anjahamiary pegmatite), hosted in high- metamorphic terrains. The Anjahamiary pegmatite lies in the Fort Dauphin (Tôlanaro) area, close to the southern coast of Madagascar. This paper reports a general description of this locality, and some preliminary results of the analytical studies of the accessory minerals collected at the mine. Among the most important analytical results is the presence of gemmy blue liddicoatite crystals with a very high Ca content, indicating the presence in this tourmaline crystal of composition near the liddicoatite end-member. LOCATION AND ACCESS The Anjahamiary pegmatite is located about 70 km NW of the town of Fort Dauphin (Tôlanaro) (Fig.
    [Show full text]
  • Geology and Selected Minerals of the Diamond Hill Quartz Mine Antreville, South Carolina by Mike Streeter, GMS Member Copyright March 2004
    Tips and Trips Page 11 The Georgia Mineral Society May 2004 Geology and Selected Minerals of the Diamond Hill Quartz Mine Antreville, South Carolina by Mike Streeter, GMS Member Copyright March 2004 Chrissy and I have spent a great deal of time at the Diamond Diamond Hill is nothing short of remarkable when you consider Hill Quartz Mine near Antreville, South Carolina over the past that the actual collecting areas occupy a total of less than 3 several months. Chester Karwoski, who purchased the acres and that each variety requires its own unique set of property in 2003, brought in some heavy earth-moving conditions to form. The three most sought after varieties of equipment last fall and has opened up some new collecting quartz at the mine are skeletal, smoky and amethyst. opportunities. On our most recent trip to the mine on February 28, 2004, members of the Rome Georgia Gem and Mineral Skeletal quartz (also known Society and the Southern Appalachian Mineral Society joined as elestial quartz) exhibits a us. Since it is no secret that that I am a geologist by trade, I layered or ribbed pattern. am often asked geological and mineralogical questions about Its appearance gave rise to collecting locales. While digging at Diamond Hill, I was asked the term "skeletal" as the to explain how the rocks and crystals formed. Now there's a crystals resemble what $64,000 question for you! I answered the question as best I someone with a good could at the time. Since then, I have researched the literature imagination would expect to obtain a more detailed explanation that I would like to share the skeleton of a quartz with you.
    [Show full text]
  • Crystal Guide for Business Success
    MARIAHEALS.COM DECEMBER 2016 C R Y S T A L G U I D E for B U S I N E S S S U C C E S S W E A L T H | H E A L T H | P R O S P E R I T Y Crystal Guide for Business Success Welcome To your Crystal Guide for Business Success for you, as a Heart Centered Entrepreneurs. You will find that it is a little different to the normal guide as the focus is on the feminine paradigm, creating lasting relationships and collaboration. As well as creating abundance, meaning the flow of energy (including money). These are my top 7 crystals to create your business success, as a Heart Centered Entrepreneur. These crystals when used in girds, meditation, ritual and ceremony will support you to activate your success. I have been using crystals for years now and when I realised that they could be used to heal, create and manifest health and wealth,things started to change in my life and the life of my clients. Now I share this knowledge with you. Many Blessings Maria ­2­ Crystal Guide for Business Success Index Citrine Quartz (Clear) Opalite Rose Quartz Pyrite Tiger's Eye Green Aventurine ­3­ Crystal Guide for Business Success Set the intention The intention with these crystals is to create success on your terms, energetically, with a solid foundation, supporting you to create your financial independence. Set your intention everytime you use one or all of these crystals. How to Use these crytals? Citrine, Quartz, Rose Quartz and Tiger Eye ­ these are wonderful combination to pop in a grid or meditate with.
    [Show full text]
  • Phenomenal Gemstones Possess Striking Optical Effects, Making Them Truly a Sight for Sore Eyes
    THE PHENOMENAL PROPERTIES OF GEMS Phenomenal gemstones possess striking optical effects, making them truly a sight for sore eyes. Here is GIA’s guide to understanding what makes each phenomenon so uniquely brilliant. ASTERISM CROSSING BANDS OF REFLECTED LIGHT CREATE A SIX-RAYED STAR-LIKE APPEARANCE. ASTERISM OCCURS IN THE DOME OF A CABOCHON, AND CAN BE SEEN IN GEMS LIKE RUBIES AND SAPPHIRES. ADULARESCENCE THE SAME SCATTERING OF LIGHT THAT MAKES THE SKY BLUE CREATES A MILKY, BLUISH-WHITE GLOW, LIKE MOONLIGHT SHINING THROUGH A VEIL OF CLOUDS. MOONSTONE IS THE ONLY GEM THAT DISPLAYS IT. AVENTURESCENCE FOUND IN NATURAL GEMS LIKE SUNSTONE FELDSPAR AND AVENTURINE QUARTZ, IT DISPLAYS A GLITTERY EFFECT CAUSED BY LIGHT REFLECTING FROM SMALL, FLAT INCLUSIONS. CHATOYANCY OTHERWISE KNOWN AS THE “CAT’S EYE” EFFECT, BANDS OF LIGHT ARE CAUSED BY THE REFLECTION OF LIGHT FROM MANY PARALLEL, NEEDLE-LIKE INCLUSIONS INSIDE A CABOCHON. NOTABLE GEMS THAT DISPLAY CHATOYANCY INCLUDE CAT’S EYE TOURMALINE AND CAT’S EYE CHRYSOBERYL. IRIDESCENCE ALSO SEEN IN SOAP BUBBLES AND OIL SLICKS, IT’S A RAINBOW EFFECT THAT IS CREATED WHEN LIGHT IS BROKEN UP INTO DIFFERENT COLORS. LOOK FOR IT IN FIRE AGATE AND OPAL AMMONITE (KNOWN BY THE TRADE AS AMMOLITE). LABR ADORESCENCE A BROAD FLASH OF COLOR THAT APPEARS IN LABRADORITE FELDSPAR, IT’S CAUSED BY LIGHT INTERACTING WITH THIN LAYERS IN THE STONE, AND DISAPPEARS WHEN THE GEM IS MOVED. INSIDER’S TIP: THE MOST COMMON PHENOMENAL COLOR IN LABRADORITE IS BLUE. PLAY OF COLOR THE FLASHING RAINBOW-LIKE COLORS IN OPAL THAT FLASH AT YOU AS YOU TURN THE STONE OR MOVE AROUND IT.
    [Show full text]
  • Mini Sweety Price and Stone Combination
    MINI SWEETY PRICE AND STONE COMBINATION REEF 1. € 1155 - Ring in pink gold with stone combination Fantastic Prasiolite with green amethyst 2. € 1950 - Ring in pink gold with stone combination Green Aventurine For Ever with aventurine and green diamonds 3. € 1900 - Ring in pink gold with stone combination Lemon Squash with lemon quartz and white diamonds IBIZA 1. € 1950 - Ring in pink gold with stone combination Turqoise Mist with aquamarin and brown diamonds 2. € 1460 - Ring in pink gold with stone combination Travel Through Amazon with amazonit 3. € 1460 - Ring in pink gold with stone combination Atlantic Waves with crapatit LAGOON 1. € 1460 - Ring in pink gold with stone combination Aquamarine Mist with milky aquamarine 2. € 1950 - Ring in pink gold with stone combination Turquoise Mist with milky aquamarine and brown diamonds 3. € 4210 - Ring in pink gold and white diamonds ISLAND 1. € 1560 - Ring in pink gold with stone combination Grey Adularia with grey moonstone 2. € 1460 - Ring in pink gold with stone combination Green Aventurine For Ever with aventurine 3. € 1460 - Ring in pink gold with stone combination Quartz Rutile Moonshine with quartz rutile SPRING 1. € 2515 - Ring in pink gold and white diamonds 2. € 1740 - Ring in pink gold with stone combination Deep Amethyst with Amethyst 3. € 1440 - Ring in pink gold with stone combinaion Pink Quartz So Lovely with Pink Quartz KASHMIR 1. € 1460 - Ring in pink gold with stone combination Quartz Rutile Moonshine with quartz rutile 2. € 1815 - Ring in yellow gold with stone combination Madeira Glow with madeira citrine 3. € 1790 - Ring in pink gold with stone combination Amethyst Blush with amethyst JOY 1.
    [Show full text]
  • Contributions to the Mineralogy of Norway
    NORSK GEOLOGISK TIDSSKRIFT CONTRIBUTIONS TO THE MINERALOGY OF NORWAY No. 5. Trace element variations in three generations of felds­ pars from the Landsverk I pegmatite, Evje, southern Norway. BY S. R. TAYLOR l, K. S. HEIER 2 and T. L. SvERDRUP3 A bstract: Li, Na, K, Rb, Cs, Pb, Tl, Ca, Sr and Ba have been determined in potassium feldspars and coexisting albites of three different generations from one large pegmatite (Landsverk I, Evje, southern Norway). In additio n Fe, Cr, Mn, Cu, Co, Ni, V, Sn and F were determined in a pink microcline and a green amazonite which were seen to grade into each other. Same element concentrations and ratios reflect the different conditions of formation of the feldspars fro m the three generations. The data indicate that the amazonite formed through metasomatic action of a "pegmatitic rest liquid" (fro m which cleavelandite crystallised) on the pink microcline of the first gene­ ration. The trace element data also indicate that the youngest K- feldspar is no t a late fractio nation product of the pegmatite, but rather a late seco ndary mineralisati on. The cause of the colouring of the amazonite is discussed and it is concluded that it is not to be found in a signi fi cant difference in compositio n fro m the pink mi crocline for any of the elements determined. lntroduction. Two of the authors (K. S. H. and S. R. T.) have made previously an extensive study of the distribution of trace elements in K-feld­ spars from a variety of pre-Cambrian basement rocks from southern Norway (TAYLOR and HEIER; 1958 a, b, 1960; HEIER and TAYLOR, l Dept.
    [Show full text]
  • AMETHYSTINE CHALCEDONY by James E
    NOTES ANDa NEW TECHNIQUES AMETHYSTINE CHALCEDONY By James E. Shigley and John I. Koivula A new amethystine chalcedony has been discovered in that this is one of the few reported occurrences Arizona. The material, marketed under the trade name where an amethyst-like, or amethystine, chalced- "Damsonite," is excellent for both jewelry and carv- ony has been found in quantities of gemological ings. The authors describe thegemological properties of importance (see Frondel, 1962). Popular gem this new type of chalcedony, and report the effects of hunters' guides, such as MacFall (1975) and heat treatment on it. Although this purple material is Anthony et al. (19821, describe minor occurrences apparently b.new color type of chalcedony, it has the same gemological properties as the other better-known in Arizona of banded purple agate, but give no types. It corresponds to a microcrystalline form of ame- indication of deposits of massive purple chalced- thyst which, when heat treated at approximately ony similar to that described here. This article 500°C becomes yellowish orange, as does some briefly summarizes the occurrence, gemological single-crystal amethyst. properties, and reaction to heat treatment of this material. LOCALITY AND OCCURRENCE The purple chalcedony described here has been Chalcedony is a microcrystalline form of quartz found at a single undisclosed locality in central that occurs in a wide variety of patterns and colors. Arizona. It was first noted as detrital fragments in Numerous types of chalcedony, such as chryso- the bed of a dry wash that cuts through a series of prase, onyx, carnelian, agate, and others, have been sedimentary rocks.
    [Show full text]
  • JEWELS of the EDWARDIANS by Elise B
    JEWELS OF THE EDWARDIANS By Elise B. Misiorowski and Nancy K. Hays Although the reign of King Edward VII of ver the last decade, interest in antique and period jew- Great Britain was relatively short (1902- elry has grown dramatically. Not only have auction 1910), the age that bears his name produced 0 houses seen a tremendous surge in both volume of goods distinctive jewelry and ushered in several sold and prices paid, but antique dealers and jewelry retail- new designs and manufacturing techniques. ers alikereportthat sales inthis area of the industry are During this period, women from the upper- excellent and should continue to be strong (Harlaess et al., most echelons of society wore a profusion of 1992). As a result, it has become even more important for extravagant jewelry as a way of demon- strating their wealth and rank. The almost- jewelers and independent appraisers to understand-and exclusive use of platinum, the greater use of know how to differentiate between-the many styles of pearls, and the sleady supply of South period jewelry on the market. African diamonds created a combination Although a number of excellent books have been writ- that will forever characterize Edwardian ten recently on various aspects of period jewelry, there are jewels. The Edwardian age, truly the last so many that the search for information is daunting. The era of the ruling classes, ended dramatically purpose of this article is to provide an overview of one type with the onset of World War I. of period jewelry, that of the Edwardian era, an age of pros- perity for the power elite at the turn of the 19th century.
    [Show full text]
  • Mineral Collecting Sites in North Carolina by W
    .'.' .., Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie RUTILE GUMMITE IN GARNET RUBY CORUNDUM GOLD TORBERNITE GARNET IN MICA ANATASE RUTILE AJTUNITE AND TORBERNITE THULITE AND PYRITE MONAZITE EMERALD CUPRITE SMOKY QUARTZ ZIRCON TORBERNITE ~/ UBRAR'l USE ONLV ,~O NOT REMOVE. fROM LIBRARY N. C. GEOLOGICAL SUHVEY Information Circular 24 Mineral Collecting Sites in North Carolina By W. F. Wilson and B. J. McKenzie Raleigh 1978 Second Printing 1980. Additional copies of this publication may be obtained from: North CarOlina Department of Natural Resources and Community Development Geological Survey Section P. O. Box 27687 ~ Raleigh. N. C. 27611 1823 --~- GEOLOGICAL SURVEY SECTION The Geological Survey Section shall, by law"...make such exami­ nation, survey, and mapping of the geology, mineralogy, and topo­ graphy of the state, including their industrial and economic utilization as it may consider necessary." In carrying out its duties under this law, the section promotes the wise conservation and use of mineral resources by industry, commerce, agriculture, and other governmental agencies for the general welfare of the citizens of North Carolina. The Section conducts a number of basic and applied research projects in environmental resource planning, mineral resource explora­ tion, mineral statistics, and systematic geologic mapping. Services constitute a major portion ofthe Sections's activities and include identi­ fying rock and mineral samples submitted by the citizens of the state and providing consulting services and specially prepared reports to other agencies that require geological information. The Geological Survey Section publishes results of research in a series of Bulletins, Economic Papers, Information Circulars, Educa­ tional Series, Geologic Maps, and Special Publications.
    [Show full text]