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Pezzottaite from Ambatovita, Madagascar: a New Gem Mineral
PEZZOTTAITE FROM AMBATOVITA, MADAGASCAR: A NEW GEM MINERAL Brendan M. Laurs, William B. (Skip) Simmons, George R. Rossman, Elizabeth P. Quinn, Shane F. McClure, Adi Peretti, Thomas Armbruster, Frank C. Hawthorne, Alexander U. Falster, Detlef Günther, Mark A. Cooper, and Bernard Grobéty Pezzottaite, ideally Cs(Be2Li)Al2Si6O18, is a new gem mineral that is the Cs,Li–rich member of the beryl group. It was discovered in November 2002 in a granitic pegmatite near Ambatovita in cen- tral Madagascar. Only a few dozen kilograms of gem rough were mined, and the deposit appears nearly exhausted. The limited number of transparent faceted stones and cat’s-eye cabochons that have been cut usually show a deep purplish pink color. Pezzottaite is distinguished from beryl by its higher refractive indices (typically no=1.615–1.619 and ne=1.607–1.610) and specific gravity values (typically 3.09–3.11). In addition, the new mineral’s infrared and Raman spectra, as well as its X-ray diffraction pattern, are distinctive, while the visible spectrum recorded with the spec- trophotometer is similar to that of morganite. The color is probably caused by radiation-induced color centers involving Mn3+. eginning with the 2003 Tucson gem shows, (Be3Sc2Si6O18; Armbruster et al., 1995), and stoppaniite cesium-rich “beryl” from Ambatovita, (Be3Fe2Si6O18; Ferraris et al., 1998; Della Ventura et Madagascar, created excitement among gem al., 2000). Pezzottaite, which is rhombohedral, is Bcollectors and connoisseurs due to its deep purplish not a Cs-rich beryl but rather a new mineral species pink color (figure 1) and the attractive chatoyancy that is closely related to beryl. -
Mineral Processing
Mineral Processing Foundations of theory and practice of minerallurgy 1st English edition JAN DRZYMALA, C. Eng., Ph.D., D.Sc. Member of the Polish Mineral Processing Society Wroclaw University of Technology 2007 Translation: J. Drzymala, A. Swatek Reviewer: A. Luszczkiewicz Published as supplied by the author ©Copyright by Jan Drzymala, Wroclaw 2007 Computer typesetting: Danuta Szyszka Cover design: Danuta Szyszka Cover photo: Sebastian Bożek Oficyna Wydawnicza Politechniki Wrocławskiej Wybrzeze Wyspianskiego 27 50-370 Wroclaw Any part of this publication can be used in any form by any means provided that the usage is acknowledged by the citation: Drzymala, J., Mineral Processing, Foundations of theory and practice of minerallurgy, Oficyna Wydawnicza PWr., 2007, www.ig.pwr.wroc.pl/minproc ISBN 978-83-7493-362-9 Contents Introduction ....................................................................................................................9 Part I Introduction to mineral processing .....................................................................13 1. From the Big Bang to mineral processing................................................................14 1.1. The formation of matter ...................................................................................14 1.2. Elementary particles.........................................................................................16 1.3. Molecules .........................................................................................................18 1.4. Solids................................................................................................................19 -
The New IMA List of Gem Materials – a Work in Progress – Updated: July 2018
The New IMA List of Gem Materials – A Work in Progress – Updated: July 2018 In the following pages of this document a comprehensive list of gem materials is presented. The list is distributed (for terms and conditions see below) via the web site of the Commission on Gem Materials of the International Mineralogical Association. The list will be updated on a regular basis. Mineral names and formulae are from the IMA List of Minerals: http://nrmima.nrm.se//IMA_Master_List_%282016-07%29.pdf. Where there is a discrepancy the IMA List of Minerals will take precedence. Explanation of column headings: IMA status: A = approved (it applies to minerals approved after the establishment of the IMA in 1958); G = grandfathered (it applies to minerals discovered before the birth of IMA, and generally considered as valid species); Rd = redefined (it applies to existing minerals which were redefined during the IMA era); Rn = renamed (it applies to existing minerals which were renamed during the IMA era); Q = questionable (it applies to poorly characterized minerals, whose validity could be doubtful). Gem material name: minerals are normal text; non-minerals are bold; rocks are all caps; organics and glasses are italicized. Caveat (IMPORTANT): inevitably there will be mistakes in a list of this type. We will be grateful to all those who will point out errors of any kind, including typos. Please email your corrections to [email protected]. Acknowledgments: The following persons, listed in alphabetic order, gave their contribution to the building and the update of the IMA List of Minerals: Vladimir Bermanec, Emmanuel Fritsch, Lee A. -
Winter 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, Geneva, Switzerland ([email protected]) Kenneth V. G. Scarratt, GIA Research, Bangkok, Thailand ([email protected]) DIAMONDS Angola and the Democratic Republic of Congo. This situ- Update on Diamond Trading in Sierra Leone. During the ation led to the Kimberley Process for certifying dia- decade-long civil war in Sierra Leone, the Revolutionary monds from mine to market, which was implemented in United Front (RUF) rebel army committed widespread 2002. With the signing of the Lomé Peace Agreement atrocities against innocent civilians, drawing global con- between the Sierra Leone government and the RUF earlier demnation by governments, human rights groups, and that year, peace has returned to the country. concerned citizens. The RUF was partially funded by the In August 2006, GIA Education instructor Ric Taylor country’s diamond resources, bringing the issue of con- traveled through the Sierra Leone diamond mining areas of flict diamonds in Sierra Leone to world attention in the Koidu, Tongo, Kenema, and Bo, some of which were once late 1990s. Meanwhile, similar diamond-funded conflicts controlled by the rebels. He saw no evidence of continuing were being waged in other African nations, such as conflict, and residents and journalists in these areas con- firmed that there is no desire to return to war. In the town of Koidu (figure 1), in the diamond mining district of Kono Figure 1. The town of Koidu, in the Kono district of in eastern Sierra Leone, one can still see the bare walls of eastern Sierra Leone, was at the center of the county’s buildings that were looted and burned, but many others protracted conflict because of the area’s diamond have been rebuilt and have roofs of corrugated metal or resources. -
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. -
Winter 2010 Gems & Gemology
G EMS & G VOLUME XLVI WINTER 2010 EMOLOGY W INTER 2010 P AGES 259–336 V OLUME Synthetics Retrospective . Scapolite from Madagascar . Pietersite from China and Namibia . New Mexifire Synthetic Opal . Identifying Historic Gems 46 N O. 4 THE QUARTERLY JOURNAL OF THE GEMOLOGICAL INSTITUTE OF AMERICA 19922 GIA G&G Winter ‘10 Journal P BC 19922 GIA G&G Winter ‘10 Journal P FC Because Public Education Happens At The Counter. GIA’s Retailer Support Kit and website A $97.00 value, shipping symposium 2011 and handling extra. ADVANCING THE SCIENCE GIA’s Retailer Support Kit has been developed to help AND BUSINESS OF GEMS sales associates educate the public about diamonds, the 4Cs, and thoroughly explain a GIA grading report. Take full advantage of all that GIA has to off er by visiting MAY 29 – 30, 2011 www.retailer.gia.edu GIA World Headquarters Robert Mouawad Campus | Carlsbad, California To order your FREE kit, log on to www.retailer.gia.edu www.symposium2011.gia.edu GGWI10 Winter 2010 Volume 46, No. 4 ® EDITORIAL __________________ 259 A Fond Farewell Alice S. Keller FEATURE ARTICLE __________________ 260 Synthetic Gem Materials in the 2000s: A Decade in Review Nathan Renfro, John I. Koivula, Wuyi Wang, and Gary Roskin Looks back on an eventful decade in the synthetic gem industry, highlighted by the commercial introduction of faceted gem-quality CVD synthetic diamonds. NOTES & N EW TECHNIQUES ______________ pg. 262 274 Yellow Scapolite from Ihosy, Madagascar Margherita Superchi, Federico Pezzotta, Elena Gambini, and Emanuela Castaman Characterizes scapolite from this locality and examines established methods of calculating the gem’s chemical composition. -
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. -
Glossary of Gemstone and Crystal Correspondences
GLOSSARY OF PRIMARY GEMSTONES USED IN METAPHYSICAL ENERGY WORK benebell wen Table of Contents Basics of Stone and Crystal Work .................. 2 R ........................................................................... 32 Clearing the Stone’s Qi ........................................ 2 S ............................................................................ 33 When Not to Clear a Stone’s Qi ...................... 4 T ........................................................................... 36 Glossary of Gemstones & Crystals ................. 6 U ........................................................................... 38 A .............................................................................. 6 V ........................................................................... 38 B ............................................................................ 10 W ......................................................................... 39 C ........................................................................... 12 X ........................................................................... 39 D ........................................................................... 14 Y............................................................................ 39 E ............................................................................ 15 Z ........................................................................... 40 F ............................................................................ 16 General Correspondences -
Summer 2007 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, GemTechLab, Geneva, Switzerland ([email protected]) Kenneth V. G. Scarratt, GIA Research, Bangkok, Thailand ([email protected]) DIAMONDS U.S. Patent and Trademark Office (USPTO) awards patents, and consequently it may affect the validity of a Bar code technology applied to diamonds. Inscribing dia- number of patents on diamond cut designs. monds using lasers and other technologies has become a A general review of U.S. patent law as it applies to routine method for identifying a stone and personalizing it diamond cuts can be found in the Winter 2002 G&G (T. for individual situations. At the same time, bar coding has W. Overton, “Legal protection for proprietary diamond evolved from the traditional one-dimensional array of lines cuts,” pp. 310–325). One of the factors that the USPTO to a two-dimensional matrix code that can hold far more considers in awarding a patent is whether the claimed information. invention is a development that would be “obvious” to Diamond laser inscription technology has now pro- a person having ordinary skill in the relevant field. An gressed to the point where a miniature matrix code can be obvious invention is not eligible for a patent. Until the inscribed on the girdle of a diamond (see, e.g., figure 1). KSR International case, the U.S. Court of Appeals for Instead of just a grading report number, the matrix code the Federal Circuit (which has jurisdiction over patent can store all of the information in the report itself, such as disputes) applied a fairly narrow definition of obvious- clarity, cut, and color grades, as well as country of origin (if ness: whether a specific motivation or suggestion to known), the name of the manufacturer, and other combine prior inventions or knowledge (referred to as specifics. -
Winter 2003 Gems & Gemology
Winter 2003 VOLUME 39, NO. 4 EDITORIAL _____________ 267 Tomorrow’s Challenge: CVD Synthetic Diamonds William E. Boyajian FEATURE ARTICLES _____________ 268 Gem-Quality Synthetic Diamonds Grown by a Chemical Vapor Deposition (CVD) Method Wuyi Wang, Thomas Moses, Robert C. Linares, James E. Shigley, Matthew Hall, and James E. Butler pg. 269 Description and identifying characteristics of Apollo Diamond Inc.’s facetable, single-crystal type IIa CVD-grown synthetic diamonds. 284 Pezzottaite from Ambatovita, Madagascar: A New Gem Mineral Brendan M. Laurs, William B. (Skip) Simmons, George R. Rossman, Elizabeth P. Quinn, Shane F. McClure, Adolf Peretti, Thomas Armbruster, Frank C. Hawthorne, Alexander U. Falster, Detlef Günther, Mark A. Cooper, and Bernard Grobéty A look at the history, geology, composition, and properties of this new cesium-rich member of the beryl group. 302 Red Beryl from Utah: A Review and Update James E. Shigley, Timothy J. Thompson, and Jeffrey D. Keith A report on the geology, history, and current status of the world’s only known occurrence of gem-quality red beryl. pg. 299 REGULAR FEATURES _____________________ 314 Lab Notes • Chrysocolla “owl” agate • Red coral • Coated diamonds • Natural emerald with nail-head spicules • Emerald with strong dichroism • High-R.I. glass imitation of tanzanite • Large clam “pearl” • Blue sapphires with unusual color zoning • Spinel with filled cavities 322 Gem News International • Comparison of three historic blue diamonds • Natural yellow diamond with nickel-related optical centers -
October 2019 Agate Explorer.Pub
Cuyuna Rock, Gem and Mineral Society The Agate Explorer October 2019 Elections Will Be Held on Saturday, November 2, along with a silent auction. Please bring any items you would like to sell to this meeting. In regard to elections, a portion of the Bylaws of the Club read as follows: Article IV: Board of Directors Sec. 1 —The Board of Directors shall have seven (7) members. Four (4) of these are elected officers of the Society: President, Vice -President, Secretary, and Treasurer: and three (3) additional elected Directors. Sec. 2 —All Board members shall serve without pay and must be Regular or Senior members having at least one year of membership in the Society. Sec. 5 —The President and Secretary shall be elected in odd numbered years and the Vice -President and Treasurer shall be elected in even numbered years. Franklin Art Center Sec. 6 —The three additional board directors shall be elected annually. Sec. 7 —A Nominating Committee shall be responsible for nominating a slate of prospective board member. In addition, any voting member can nominate a candidate Club Information to the slate of nominees. Website -www.cuyunarockclub.org Sec. 8 —Election of Board members shall take place at the November annual meeting of Email [email protected] the Society. Board members will be elected by a simple majority of voting members present at the annual meeting. Meeting Place Sec. 9 —The term of office shall be two (2) years for officers, and one (1) year for the Lower level other board members. The term of office shall commence on January 1. -
Josephine County, Oregon, Historical Society Document Oregon, Minerals
) OREGON WELCOMES rock hunters to ROCKHOUND RULES the Agate State.... Oregon is a collector's paradise, but Collectors of every age enjoy the thrill of even in a paradise it is wise to follow a few discovering a flawless gem or a rare fossil, and simple rules ... certainly they will tend to Oregon is the place to find them. assure the best possible success. Come on out and try your luck in one or all of the state's many rich deposits. However, don't be disappointed if you fail I. Select several sites within a to "strike it rich" on your first outing ...it took fairly small area to avoid spreading the residents of Canyon City, in central Ore valuable collecting time too thin ... gon, I 0 years to discover they had paved their become informed on the material streets with gold-bearing gravel! available and its exact location. 2. Don't hesitate to ask local col lectors for information about se lected sites ...check with rockhound clubs wherever they are found. 3. Bring along the proper tools and equipment-including boots and sturdy clothing-for field work ... depending on the material sought, you may find use for a rockhammer, shovel, prybar, sledge and chisel, or light pick mattock. 4. Make special preparations for seasonal weather conditions-can teens, C?PS and sunglasses for the pesert, warm jackets for the moun 0 tains, etc. 5. Obtain permission of land owners before entering private property ... don't leave campsite debris scattered about and BE CAREFUL WITH FIRE. 6. Take care in entering aban doned mine shafts-you enter at your own risk.