The New IMA List of Gem Materials – a Work in Progress – Updated: July 2018
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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. -
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. -
This Dissertation Has Been 62—2136 M Icrofilm Ed Exactly As Received GIELISSE, Peter Jacob M., 1934- INVESTIGATION of PHASE EQ
This dissertation has been 62—2136 microfilmed exactly as received GIELISSE, Peter Jacob M., 1934- INVESTIGATION OF PHASE EQUILIBRIA IN THE SYSTEM ALUMINA-BORON OXIDE-SILICA. The Ohio State University, Ph.D., 1961 M ineralogy University Microfilms, Inc., Ann Arbor, Michigan INVESTIGATION OP PHASE EQUILIBRIA IN THE SYSTEM ALUMINA-BORON OXIDE-SILICA DISSERTATION Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of the Ohio State University By Peter Jacob M. Gielisse, M. S. The Ohio State University 1961 Approved by Adviser Department of Mineralogy ACKNOWLEDGMENTS The writer wishes to extend his sincere thanks to the many people without whose help the preparation of this dissertation would have been impossible. He is indebted in particular to his adviser, Dr. Wilfrid R. Foster, for his invaluable aid, advice and many kindnesses; to the other members of the faculty of the Department of Mineral ogy, Drs. Ernest G. Ehlers, Henry E. Wenden, and Rodney T Tettenhorst; and to his friend and colleague, Thomas J. Rockett. Acknowledgment is also made for financial support re ceived under contract No. AF 33(616)-3189, sponsored by Aeronautical Research Laboratories, Air Force Research Division, Wright Patterson Air Force Base, Ohio; as well as for aid received through a Mershon National Graduate Fellowship awarded to the writer by the Mershon Committee on Education in National Security for 1960-‘61'. It goes without saying that he is also most grate ful to his wife, Anna, for her excellent help and encour agement over the years. TABLE OF CONTENTS Page INTRODUCTION ...................................... -
Minerals of the San Luis Valley and Adjacent Areas of Colorado Charles F
New Mexico Geological Society Downloaded from: http://nmgs.nmt.edu/publications/guidebooks/22 Minerals of the San Luis Valley and adjacent areas of Colorado Charles F. Bauer, 1971, pp. 231-234 in: San Luis Basin (Colorado), James, H. L.; [ed.], New Mexico Geological Society 22nd Annual Fall Field Conference Guidebook, 340 p. This is one of many related papers that were included in the 1971 NMGS Fall Field Conference Guidebook. Annual NMGS Fall Field Conference Guidebooks Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscience papers. These books have set the national standard for geologic guidebooks and are an essential geologic reference for anyone working in or around New Mexico. Free Downloads NMGS has decided to make peer-reviewed papers from our Fall Field Conference guidebooks available for free download. Non-members will have access to guidebook papers two years after publication. Members have access to all papers. This is in keeping with our mission of promoting interest, research, and cooperation regarding geology in New Mexico. However, guidebook sales represent a significant proportion of our operating budget. Therefore, only research papers are available for download. Road logs, mini-papers, maps, stratigraphic charts, and other selected content are available only in the printed guidebooks. Copyright Information Publications of the New Mexico Geological Society, printed and electronic, are protected by the copyright laws of the United States. -
The Telephone City Crystal Brantford Lapidary & Mineral Society
THE TELEPHONE CITY CRYSTAL BRANTFORD LAPIDARY & MINERAL SOCIETY JANUARY 2017 Volume 71 Issue 1 INSIDE THIS ISSUE: JANUARY MEETING— 2 EARTH ON THE MOVE& ARAGONITE UPCOMING EVENTS & 3 CLUB INFO PIECE OF DINOSAUR 4 TAIL IN AMBER RARE GEM MINE 5 & TUMBLER GRIT ROCK TUMBLING 6 MONTHLY MINERAL - 7 APATITE 2016 EXECUTIVE & 8 MISC. December Meeting Highlight Photo- listing on page 2 1 THE TELEPHONE CITY CRYSTAL DATE: FRIDAY JANUARY 20, 2017 TIME: 7:30 PM WHERE: TB COSTAIN/S.C. JOHNSON COMMUNITY CENTER, 16 MORRELL ST. BRANTFORD, ONT. PROGRAM: RENE PERRIN: “EARTH ON THE MOVE” “The title is "Earth on the Move" featuring how the earth has moved and is mov- ing now at both the large scale as in India moving North with various other big and much smaller ex- amples with a beautiful graphic showing all of the global movements as tracked by stations all over the world. This is a great image showing the movement directions with arrows.” THE MINERAL ARAGONITE Calcium carbonate forms as both Aragonite and Calcite, and these two minerals only differ in theircrystallization. Cal- cite, the more common mineral, forms in trigonal crystals, whereas Aragonite forms orthorhombic crystals. On occasion, crystals of Aragonite and Calcite are too small to be individually determined, and it is only possible to distinguish these two minerals with optical or x-ray testing. The true identity of microcrystalline forms of Aragonite or Calcite may also not be known without complex testing, and this can also cause a confusion between these species. Most large Aragonite crystals are twinned growths of three individual crystals that form pseudohexagonal trillings. -
Minerals - Properties and Identification Lab
MINERALS - PROPERTIES AND IDENTIFICATION LAB INTRODUCTION TO THE MINERALS - is a description of 30 important minerals for GLG 103. Each mineral species has its properties described, as well as a link to other images of that mineral. A geologic description of the particular image is also included. This group of pictures is intended to give you an overview of how the mineral may look in different geologic settings. MINERALS TO IDENTIFY - is the identification of 20 minerals. It consists of an “interactive” PowerPoint that duplicates the lab setting. It allows you to perform tests on each unknown mineral and to make decisions as to its properties for the mineral’s identification. To assist you in your quest for mineral identification, an 8 page MINERAL IDENTIFICATION KEY is provided as a separate PowerPoint. It is required that you print this 8 page key (not the entire PowerPoint) and use it during the mineral identification process. You will enter your answers in the Mineral Identification Quiz in BlackBoard. This is an interactive PowerPoint and it is intended that you click on various links throughout the lesson. However, if you do accidently hit a key it may advance to the next slide in the list, which may not be the one you want to observe. You can go back by using either the “Backspace” key or the link to “Back to Page 1” box in the bottom right hand corner of each page. WARNING – This PowerPoint is over 200 pages in length so if you want to print out certain pages make sure to tell your printer which pages to print - not the entire powerpoint. -
John S. White Mineral and Gem Collections GENERAL Nephrite Boulder – Trinity County, California Pyrite Navajun, Logroño, Spain 20-11-3
John S. White Mineral and Gem Collections GENERAL Nephrite boulder – Trinity County, California Pyrite Navajun, Logroño, Spain 20-11-3 12 cm Figured specimen (12) Beryl var. emerald – Crabtree Mountain emerald mine, Mitchell Co., N.C. G5-9-12 5 cm Ocean jasper – Cabamby mine, Majunga, Madagascar – G10-9-1 4.3 cm Ocean jasper – Cabamby mine, Majunga, Madagascar G11-2-3 4 cm Andalusite, variety chiastolite – China 10-2-43 2.7 cm Graphic granite – Madagascar 17-9-3 4.5 cm Garnet color suite – mixed localities G8-11-1 Sasha Siemel Beryl Jaguar hunter Governador Valadares & Minas Gerais, Brazil Mineral dealer 19-4-2 & 19-5-4 These specimens were sold by Sasha Siemel to friends of mine at a mineral show in Doylestown, PA, 1956 Gas bubble in fluorite Cave-in-Rock, Illinois 4-12-3 Russell Feather photo Regional Collection Pennsylvania – Maryland - Virginia Magnetite – Grace mine, Morgantown, PA 4-6-1 6.5 cm Rutile – Parkesburg, Chester County, PA 3-9-16 5 cm Dolomite - Ober & Binkley quarry, E. Petersburg, Lancaster Co., PA 17-2-6 10.5 cm Pyromorphite – Wheatley mine, Phoenixville, Chester Co., PA 6-6-9 9 cm Analcime & Apophyllite – Cornwall mine, Cornwall, Lebanon County, PA 20-10-15 10 cm Quartz – Reading anthracite mine, near St. Clair, Schuykill Co., PA 19-9-7 10 cm Fluorapatite & Actinolite – Silver Hill quarry, Brecknock Twp., Lancaster Co., PA 18-2-18 11.5 cm Wavellite – Mt. Pleasant Mills quarry, Perry Twp., Snyder Co., PA 18-2-19 4 cm Strontianite – Oak Hill quarry, Centre County, PA 21-11-1 5.5 cm Strontianite – Tonoloway limestone, Mt. -
Turquoise in the Burro Mountains, New Mexico
TURQUOISE IN THE BURRO MOUNTAINS, NEW MEXICO. EDWARD R. ZALINSKI. [The following notes are from data collected during the year •9o5 while the writer was superintendent of the Azure Mining Company's property near Silver City. It was his intention to make a detailed study of the sub- ject, but this professional duties have hitherto prevented and in the following pages are presented the tentative conclusionsof an unfinished investigation.] HISTORY AND LOCALITIES. Turquoiseoriginally came fr4m' Persia by wayof Turkeyand was importedby the Venetians,who called it Turchesa,of which its presentname is the French variation. In America it has long been known to the southwesternIndians and was used by them for ornaments and mosaic work. Professor W. P. Blake, in •858 and '59, called attention to its occurrence at Cerrillos, New Mexico, where it had been mined by the aboriginesand early Spaniards. This locality has producedsome valuable gems, but the mines are not at present worked. Turquoise has been found also at Turquoise Moun- tain, CochiseCounty, and Mineral Park, Mohave County, Ari- zona; near Columbus and near Crescent, in southern Nevada; in Fresno County, California; and in Colorado. In New Mexico, besides Cerrillos mentioned above, it is known at Hachiti; in the Burro Mountains, Grant County; and in the Jarrilla Moun- tains, Otero County. The modern discovery of turquoise in the Burro Mountains dates from •875, but these depositswere known to the Indians and were worked by them. Remains of ancient operationsare still to be seen, while stone hammers, implements and fragments of pottery have been found near the old excavations. -
Quartz Rock Forming Minerals
Quartz Rock Forming Minerals Ransom never ferment any ilks devastates convexedly, is Boniface unseasoned and embryonic enough? Charles unlace temerariously as drained Friedric extemporize her susceptibleness motives asthmatically. Erek never shrugged any waggon invited threefold, is Jessee altruistic and satiric enough? Look at which the point of feldspars, has used as lamellar twinning and minerals forming This is beyond strong contrast to the observed highly anisotropic needle tip plate morphologies. Chrysoprase is coloured green skin the presence of nickel. The rock track full service gas bubbles, is light in weight, and former light colored. When the magma does someone reach this surface it produces a pancake of geologic structures. One distinguishing characteristic of gneiss is its banding. It cab be used as nail polish while making tumbled stones in poor rock tumbler. Whatever your case for picking up a wish, we remind you observed that it at made up while many small individual grains. Garnets may thus occur on some igneous rocks. This write of biotite shows a strap of pleochroic colors caused by different crystal orientations. Some limestones are formed from buried coral reefs. Strickland Quarry, Strickland pegmatite, Collins Hill, Portland, Middlesex Co. Marble is fine grained to as coarse grained and crystals are shallow easy so see. The following diagram shows the general battle of four metamorpic index minerals. Diamond led the hardest mineral and love scratch above other minerals, without getting scratched itself, Talc is powerful the other troop of the attack, being the weakest mineral. Overbrook, Hestonville, Philadelphia Co. The devise of the crystal, and simple precise arrangement of its crystal faces, relate to obscure internal structure, and are expressions of set regular visit the atoms are arranged. -
Occurrences of Grandidierite, Serendibite and Tourmaline Near Ihosy, Southern Madagascar
SHORT COMMUNICATIONS 131 tine, lavendulan, schoepite, vandendriesscheite, Collins, J. H. (1881) Catalogue of the Minerals in the kahlerite and metakahlerite are confirmed for the Museum of the Royal Institution of Cornwall, 2, 32. first time from the British Isles. Foshag, W. F. (1924)Am. Mineral. 9, 30-1. Goldsmith (1877) Proc. Acad. Nat. Sci. Philadelphia, Acknowledgements. For X-ray diffraction work, the 192. authors are grateful to the late Dr R. J. Davis of the Guillemin, C. (1956) Bull. Soc. franc. Min. Crist. 79, British Museum (Natural History), to Dr T. M. Seward, 7-95. then of the Geology Department, University of Man- Harrison, R. K., Tresham, A. E., Young, B. R. and chester, to Dr D. Rushton, then of the Manchester Lawson, R. I. (1975) Bull. Geol. Survey Great Britain, Museum, and to the staff of the Royal Scottish Museum. 52, 1-26. We thank Ian Brough of the Metallurgy Department, Macpherson, H. G. and Livingstone, A. (1982) Gloss- University of Manchester and U.M.I.S.T. for scanning ary of Scottish Mineral Species 1981. Scottish Journal electron microscope analysis. For their help in field work of Geology. we thank Dr George Ryback, Dr T. M. Seward and Miller, J. M. and Taylor, K. (1966) Bull. Geol. Survey Mr T. G. P. Ziemba. Great Britain, 25, 1-8. Weisbach, A. (1871)Neues Jahrb. Min. 869-70. -- (1877) Ibid., 1. References [Manuscript received 25 January 1989; Breithaupt, J. F. A. (1837)J. prakt. Chem. 10,505. revised 18 April 1989] Clark, A. M., Couper, A. G., Embrey, P. G. -
WITWATERSRAND GEM and MINERAL CLUB
WITWATERSRAND GEM and MINERAL CLUB Newsletter for SEPTEMBER 2014 P O Box 3708 Cresta 2118 South Africa nd Room 215 G, 2 floor Department of Geology University of Johannesburg Auckland Park JUST A WORD FROM THE EDITOR Whilst we are surviving hopefully the last of the winter, spring is upon us. And so out with the old and in with the new - the new amended constitution was accepted on the 13th August at the Special General Meeting. Thank you for all who attended the meeting, voted and enjoyed the social evening afterwards. Please forward any gem or mineral news, adverts or articles which you feel should be within our next newsletter, please forward to [email protected] or call me on 072 591 6202. Rock on!!! EVENT CALENDAR FOR 2014 – Please diarize the following dates THEMED EVENING on 10th September at UJ – Bring specimens relating to the Feldspar Group and Pseudomorphs SPEAKER EVENING on 24th September at UJ – no speaker due to the public holiday, however we will view a presentation from the Dallas Mineral Collection Symposium, 2013 The 21st General Meeting of the International Mineralogical Association will be held in South Africa at the Sandton Convention Centre, Gauteng, from 1–5 September 2014. For more information go to www.ima2014.co.za Kimberley Diamond Symposium & Trade Show: 11 - 13 September 2014 African Exploration Showcase : 7 November 2014 WGMC Year-end evening: 26 November 2014 (members only) CLUB MEETINGS The club meets every second and last Wednesday of each month at 19h00 for 19h30, excluding December, at the University of Johannesburg, Auckland Park, Department of Geology, Second Floor. -
Khmaralite, a New Beryllium-Bearing Mineral Related to Sapphirine: a Superstructure Resulting from Partial Ordering of Be, Al, and Si on Tetrahedral Sites
American Mineralogist, Volume 84, pages 1650–1660, 1999 Khmaralite, a new beryllium-bearing mineral related to sapphirine: A superstructure resulting from partial ordering of Be, Al, and Si on tetrahedral sites JACQUES BARBIER,1,* EDWARD S. GREW,2 PAULUS B. MOORE,3 AND SHU-CHUN SU4 1Department of Chemistry, McMaster University, Hamilton, Ontario, L8S 4M1 Canada 2Department of Geological Sciences, University of Maine 5790 Bryand Center Orono, Maine 04469, U.S.A. 3P.O. Box 703, Warwick, New York,10990, U.S.A. 4Hercules Research Center, 500 Hercules Road, Wilmington, Delaware 19808, U.S.A. ABSTRACT 3+ 2+ Khmaralite, Ca0.04Mg5.46Fe 0.12Fe 1.87Al14.26Be1.43B0.02Si4.80O40, is a new mineral closely related to sapphirine from Khmara Bay, Enderby Land, Antarctica. It occurs in a pegmatite metamorphosed at T ≥ 820 °C, P ≥ 10 kbar. The minerals surinamite, musgravite, and sillimanite associated with khmaralite at Casey Bay saturate it in BeO, and thus its BeO content could be close to the maximum possible. Optically, khmaralite is biaxial (–); at λ = 589 nm, α = 1.725(2), β = 1.740(2), γ = 1.741(2), 2Vmeas = 34.4 (1.8)°, v > r strong, and β b. The weak superstructure reported using electron diffraction has been confirmed by single-crystal X-ray diffraction. The superstructure corresponds to a doubling of the a axis in monoclinic sapphirine-2M (P21/c setting) with the following unit-cell parameters: a = 3 19.800(1), b = 14.371(1), c = 11.254(1) Å, β = 125.53(1)°, Z = 4, Dcalc = 3.61 g/cm .