Prospecting for and Instructions on How to Finish Fire Agate Gems
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Download PDF About Minerals Sorted by Mineral Name
MINERALS SORTED BY NAME Here is an alphabetical list of minerals discussed on this site. More information on and photographs of these minerals in Kentucky is available in the book “Rocks and Minerals of Kentucky” (Anderson, 1994). APATITE Crystal system: hexagonal. Fracture: conchoidal. Color: red, brown, white. Hardness: 5.0. Luster: opaque or semitransparent. Specific gravity: 3.1. Apatite, also called cellophane, occurs in peridotites in eastern and western Kentucky. A microcrystalline variety of collophane found in northern Woodford County is dark reddish brown, porous, and occurs in phosphatic beds, lenses, and nodules in the Tanglewood Member of the Lexington Limestone. Some fossils in the Tanglewood Member are coated with phosphate. Beds are generally very thin, but occasionally several feet thick. The Woodford County phosphate beds were mined during the early 1900s near Wallace, Ky. BARITE Crystal system: orthorhombic. Cleavage: often in groups of platy or tabular crystals. Color: usually white, but may be light shades of blue, brown, yellow, or red. Hardness: 3.0 to 3.5. Streak: white. Luster: vitreous to pearly. Specific gravity: 4.5. Tenacity: brittle. Uses: in heavy muds in oil-well drilling, to increase brilliance in the glass-making industry, as filler for paper, cosmetics, textiles, linoleum, rubber goods, paints. Barite generally occurs in a white massive variety (often appearing earthy when weathered), although some clear to bluish, bladed barite crystals have been observed in several vein deposits in central Kentucky, and commonly occurs as a solid solution series with celestite where barium and strontium can substitute for each other. Various nodular zones have been observed in Silurian–Devonian rocks in east-central Kentucky. -
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. -
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. -
City of St. Peters Board of Aldermen Tentative Agenda for Regular Meeting St
CITY OF ST. PETERS BOARD OF ALDERMEN TENTATIVE AGENDA FOR REGULAR MEETING ST. PETERS JUSTICE CENTER, 1020 GRAND TETON DRIVE, ST. PETERS, MO 63376 OCTOBER 22, 2020 – 6:30 P.M. A. Call to Order, Mayor Len Pagano B. Roll Call C. Opening Ceremonies 1. Invocation 2. Pledge of Allegiance 3. Proclamations: National Arts and Humanities Month, Jill Tutt 4. Presentation: No Hunger Holiday, Mike Narkawicz 5. Recognition: Random Acts of Kindness D. Approval of Minutes: The Board of Aldermen Work Session meeting of October 8, 2020; and the Regular Board of Aldermen meeting of October 8, 2020. E. Reports of Officers, Boards and Commissions 1. Mayoral Report of Appointments to Boards and Commissions a. Appointment to the Veterans Memorial Commission 2. City Administrator’s Report: 3. Report of Director, Planning, Community and Economic Development: 4. St. Peters Business Spotlight: None F. Open Forum 1. Citizens Petitions and Comments 2. Communications from the Elected Officials 3. Announcements G. Public Hearings: None H. Unfinished Business Items: None I. New Business Items: 1. Bill No. 20-118: Bill authorizing the City Administrator of the City of St. Peters, Missouri, to execute a Certain Subrecipient Agreement between St. Charles County (Grantee) and the City of St. Peters (Subrecipient) for conducting City Community Development Block Grant (CDBG) Programs with 2020 Federal Funding 2. Bill No. 20-119: Bill of the City of St. Peters, Missouri, deleting Chapter 615 of the Code of the City of St. Peters, Missouri, in its entirety; enacting, in lieu thereof, a new Chapter 615; and providing for the licensing and regulation of body art establishments and body artists 3. -
March 2019 Agate Explorer.Pub
Cuyuna Rock, Gem and Mineral Society The Agate Explorer March 2019 Summer Field Trip Plans are being made for a long weekend trip to Thunder Bay to collect amethyst. The tentative dates are Friday -Sunday, July 5 -7. A sign -up sheet will be available at upcoming meeting in order to plan this trip. It is necessary to have a passport to travel to Canada. You may also check to see if an enhanced driver’s license is acceptable. March meeting Open Shop from 9 a.m. —noon Franklin Art Center Club member, Ray Strassberg, will be available for members to learn how Club Information to cut rocks using the 10” or 16” inch saws. Website -www.cuyunarockclub.org - Email [email protected] Bring rocks of your own or purchase something in the Rock Room. Meeting Place Lower level Franklin Arts Center Kids’ Program 1001 Kingwood St, Brainerd, MN 56401 Did you know that there are many Directions .4 mile east of Business Hwy. 371 different kinds of Lake Superior & Hwy. 210 intersection. agates? Lisa will tell you all about it (Castle turret water tower.) at the March meeting! Date/Time the 2nd Saturday of each month Rock Wrappers at 2 p.m. unless otherwise noted. Meets starting at 10 a.m. on meeting Saturdays. Club Dues $20/ family ,An open gathering for wire wrappers. Hang out with other wrappers, Free /unaccompanied juniors and work on your projects. (Bring all supplies needed.) Membership runs Learn tricks to make wrapping easier, a new design, from Jan. 1-Dec. 31st. or perhaps a new place to find supplies. -
Symposium on Agate and Cryptocrystalline Quartz
Symposium on Agate and Cryptocrystalline Quartz September 10 – 13, 2005 Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter; Colorado School of Mines Geology Museum; and U.S. Geological Survey 2 Cover Photos {top left} Fortification agate, Hinsdale County, Colorado, collection of the Geology Museum, Colorado School of Mines. Coloration of alternating concentric bands is due to infiltration of Fe with groundwater into the porous chalcedony layers, leaving the impermeable chalcedony bands uncolored (white): ground water was introduced via the symmetric fractures, evidenced by darker brown hues along the orthogonal lines. Specimen about 4 inches across; photo Dan Kile. {lower left} Photomicrograph showing, in crossed-polarized light, a rhyolite thunder egg shell (lower left) a fibrous phase of silica, opal-CTLS (appearing as a layer of tan fibers bordering the rhyolite cavity wall), and spherulitic and radiating fibrous forms of chalcedony. Field of view approximately 4.8 mm high; photo Dan Kile. {center right} Photomicrograph of the same field of view, but with a 1 λ (first-order red) waveplate inserted to illustrate the length-fast nature of the chalcedony (yellow-orange) and the length-slow character of the opal CTLS (blue). Field of view about 4.8 mm high; photo Dan Kile. Copyright of articles and photographs is retained by authors and Friends of Mineralogy, Colorado Chapter; reproduction by electronic or other means without permission is prohibited 3 Symposium on Agate and Cryptocrystalline Quartz Program and Abstracts September 10 – 13, 2005 Editors Daniel Kile Thomas Michalski Peter Modreski Held at Green Center, Colorado School of Mines Golden, Colorado Sponsored by Friends of Mineralogy, Colorado Chapter Colorado School of Mines Geology Museum U.S. -
Compilation of Reported Sapphire Occurrences in Montana
Report of Investigation 23 Compilation of Reported Sapphire Occurrences in Montana Richard B. Berg 2015 Cover photo by Richard Berg. Sapphires (very pale green and colorless) concentrated by panning. The small red grains are garnets, commonly found with sapphires in western Montana, and the black sand is mainly magnetite. Compilation of Reported Sapphire Occurrences, RI 23 Compilation of Reported Sapphire Occurrences in Montana Richard B. Berg Montana Bureau of Mines and Geology MBMG Report of Investigation 23 2015 i Compilation of Reported Sapphire Occurrences, RI 23 TABLE OF CONTENTS Introduction ............................................................................................................................1 Descriptions of Occurrences ..................................................................................................7 Selected Bibliography of Articles on Montana Sapphires ................................................... 75 General Montana ............................................................................................................75 Yogo ................................................................................................................................ 75 Southwestern Montana Alluvial Deposits........................................................................ 76 Specifi cally Rock Creek sapphire district ........................................................................ 76 Specifi cally Dry Cottonwood Creek deposit and the Butte area .................................... -
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. -
About Our Mineral World
About Our Mineral World Compiled from series of Articles titled "TRIVIAL PURSUITS" from News Nuggets by Paul F. Hlava "The study of the natural sciences ought to expand the mind and enlarge the ability to grasp intellectual problems." Source?? "Mineral collecting can lead the interested and inquisitive person into the broader fields of geology and chemistry. This progression should be the proper outcome. Collecting for its own sake adds nothing to a person's understanding of the world about him. Learning to recognize minerals is only a beginning. The real satisfaction in mineralogy is in gaining knowledge of the ways in which minerals are formed in the earth, of the chemistry of the minerals and of the ways atoms are packed together to form crystals. Only by grouping minerals into definite categories is is possible to study, describe, and discuss them in a systematic and intelligent manner." Rock and Minerals, 1869, p. 260. Table of Contents: AGATE, JASPER, CHERT AND .............................................................................................................................2 GARNETS..................................................................................................................................................................2 GOLD.........................................................................................................................................................................3 "The Mystery of the Magnetic Dinosaur Bones" .......................................................................................................4 -
On Palaeozoic–Mesozoic Brittle Normal Faults Along the SW Barents Sea Margin: Fault Processes and Implications for Basement Permeability and Margin Evolution
research-articleResearch ArticleXXX10.1144/jgs2014-018K. Indrevær et al.Brittle Faults on the SW Barents Sea Margin 2014 Downloaded from http://jgs.lyellcollection.org/ by guest on October 9, 2021 Journal of the Geological Society, London. http://dx.doi.org/10.1144/jgs2014-018 Published Online First © 2014 The Authors On Palaeozoic–Mesozoic brittle normal faults along the SW Barents Sea margin: fault processes and implications for basement permeability and margin evolution KJETIL INDREVÆR1,2*, HOLGER STUNITZ1 & STEFFEN G. BERGH1 1Department of Geology, University of Tromsø, N-9037 Tromsø, Norway 2DONG E&P Norge AS, Roald Amundsens Plass 1, N-9257 Tromsø, Norway *Corresponding author (e-mail: [email protected]) Abstract: Palaeozoic–Mesozoic brittle normal faults onshore along the SW Barents Sea passive margin off northern Norway give valuable insight into fault and fluid flow processes from the lower brittle crust. Micro- structural evidence suggests that Late Permian–Early Triassic faulting took place during multiple phases, with initial fault movement at minimum P–T conditions of c. 300 °C and c. 240 MPa (c. 10 km depth), followed by later fault movement at minimum P–T conditions of c. 275 °C and c. 220 MPa (c. 8.5 km depth). The study shows that pore pressures locally reached lithostatic levels (240 MPa) during faulting and that faulting came to a halt during early (deep) stages of rifting along the margin. Fault permeability has been controlled by heal- ing and precipitation processes through time, which have sealed off the core zone and eventually the damage zones after faulting. A minimum average exhumation rate of c. -
Common Fossils, Rocks and Minerals in Scotland
Geology ish .c ott o Sc m C Common Fossils, Rocks and o d lle n cti la ng in Scot Minerals in Scotland Scotland is extremely lucky as it has many different types of fossils, minerals and rocks. It is possible to find and collect rock, fossil and mineral specimens provided it is done in a responsible manner and the Geological Fieldwork Code is followed. In time the Scottish Fossil Code will provide detailed information on the collection and care of fossils in Scotland (both codes can be found on www.ScottishGeology.com). The following pages list some of the more commonly found geological specimens. In museums and books, we often see only the best examples. Here, we have chosen not to photograph such specimens, but instead have chosen examples which are more likely to be found. The pictures here have a pencil for scale. Words in bold type will be explained, and you’ll find a geological timescale at the end to explain words shown in blue. The Fieldwork Code - the most important bits... Remember the Country Code and observe local bylaws - shut gates and leave no litter Look for loose material to collect first, to avoid hammering at all Don't hammer indiscriminately and remember you don't always need to take a sample Keep collecting to a minimum; leave material left for other people to enjoy If you find anything interesting, tell the local museum. Always make a note/take a photo of where you found it Try to leave sites as you find them Always wear protective goggles when hammering and be aware of where other people are around you Make sure you don't get cut off by the tides 1 Fossils - Animals with Backbones Animals with backbones, for example fish, dogs, and humans are grouped together and called vertebrates. -
Of the Grand Cameo: a Holistic Approach to Understanding the Piece, Its Origins and Its Context Constantine Prince Sidamon-Eristoff Sotheby's Institute of Art
Sotheby's Institute of Art Digital Commons @ SIA MA Theses Student Scholarship and Creative Work 2018 The "Whys" of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context Constantine Prince Sidamon-Eristoff Sotheby's Institute of Art Follow this and additional works at: https://digitalcommons.sia.edu/stu_theses Part of the Ancient, Medieval, Renaissance and Baroque Art and Architecture Commons, Fine Arts Commons, and the Metal and Jewelry Arts Commons Recommended Citation Sidamon-Eristoff, Constantine Prince, "The "Whys" of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context" (2018). MA Theses. 14. https://digitalcommons.sia.edu/stu_theses/14 This Thesis is brought to you for free and open access by the Student Scholarship and Creative Work at Digital Commons @ SIA. It has been accepted for inclusion in MA Theses by an authorized administrator of Digital Commons @ SIA. For more information, please contact [email protected]. The “Whys” of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context by Constantine P. Sidamon-Eristoff A thesis submitted in conformity With the requirements for the Master’s Degree Fine and Decorative Art and Design Sotheby’s Institute of Art 2018 Word Count: 14,998 The “Whys” of the Grand Cameo: A Holistic Approach to Understanding the Piece, its Origins and its Context By: Constantine P. Sidamon-Eristoff The Grand Cameo for France is the largest cameo surviving from antiquity. Scholars have debated who is portrayed on the stone and what its scene means for centuries, often, although not always, limiting their interpretations to this narrow area and typically only discussing other causes in passing.