 | | Journal (article/letter/editorial) | | typische spectrum voor trigonale kwarts (= 'low-quartz', 'Tief-Quarz', a - S i 0 ) ; een lage vlakke achtergrondruis...kenmerken: '...a type of massive, fine-grained, or dense quartz that contains relatively large amounts of admixed...bekend. Een bekende vindplaats bevindt zich bij Nunkirchen bij Dillingen. Hier is jaspis ingesloten tussen...latter is brought about by a 12 /xm thick layer of quartz, which in chemical composition and structure differs...(Debije-Scherrer method) reveals the typical spectrum of low-quartz (o-Si0 ). It is assumed that the greenish hue can |  | | Book (chapter) | | (1990). Na-bentonite = Na-rich montmorillonite + quartz, CCM 35, 81 (1987). Na-beryl = Na-rich beryl, EJM...coal), Egleston 217 (1892). Nadelquarz = acicular quartz, Kipfer 118 (1974). Nadelspat = acicular aragonite...479 (1993). Nadelstein (?) = grey Al+H±Li-rich quartz + acicular rutile, Kipfer 118 (1974). Nadelzeolith...(1988). narancstopáz = heated yellow gem Fe-rich quartz, László 274 (1995). Na-rectorite = Na-rich rectorite...necronite = orthoclase, Dana 6th, 318 (1892). nectic quartz = opal-CT, Egleston 238 (1892). nectilite = opal-CT |  | | Book | | of quartz and its a great gems other than and varieties, with favorite location of quartz agate...beautiful in BOX 244 3BURY, VT 0581Q «r and Other Quartz Gems by ! the field and useful gems or novelties... THE HOOF. OF AGATES And Other Quartz Gems And Other Quartz Genis liy Lelande (Juich CHILTON...author believes that this is a needed book on the quartz gem minerals. Needed by whom? Needed by the more...cut into cabochons or faceted stones are in the quartz family, a book is needed that gives complete details | | | Book | | AGATES SBURY. vr 06819 - ---- ·--· and Other Quartz Gems by LELANDE QUICK co-author of G emcraft The...of agate collecting, the varie ties and forms of quartz gems other than agate, opal and its varieties,...great favorite with collectors. The location of quartz gems throughout the world is discussed, followed...org/details/bookofagatesot00lela THE BOOK OF AGATES And Otl1er Quartz Gems By Lela11de Oi,ich CHILTON BOOI'i COMPANY.... . . . . . 25 Glossary of Agate a11cl Otl1er Quartz Gen1 Tern1s. . . . . . . . . . . . 30 Cl1a1)ter |  | | Book (edition) | | tetrabromide. crystal. A as macroscopic genitic quartz heavy liquid used for specific-gravity determinations...many varieties of chalcedony (cryptocrystalline quartz). Best known in its curved, banded form, it also...occurring In gray, reddish or brownish alpha quartz. Quartz which has formed at less than 573°C. in veins...and large pegmatites (Dana). Includes most of the quartz cut as gems. Atomic varies Strongly gent, 0.059...structure GEMOLOGY when they change to topaz quartz. Other authorities with less practical experience |  | | Book (edition) | | prase, and as macroscopic inclusions in sagenitic quartz and other gem¬ stones. S.G. 3.0-3.2. R.I. 1.61/1...purplish red spinel. ina, or artificial corundum, quartz. Quartz which has formed at less than 573°C. in veins...large pegma¬ tites (Dana). Includes most of the quartz cut as gems. Atomic structure varies as temperature...there is a distinct and perma¬ nent change to beta quartz. Wild states that most fired amethysts change in...300° up to about 573° when they change to topaz quartz. Other authorities with less practical experience |  | | Journal (issue) | | gems such as beryl, chrysoberyl, diamond, garnet, quartz, tourmaline, and zircon.) The gems were derived...Gemmological Conference Abstract Volume, Idar-Oberstein, Germany, Sept. 27–Oct. 3, pp. 28–30. Kane R.E. (2003) The...described as a rock consisting of magnesite and quartz (Johnson and Koivula, 1996) or of both minerals...galena mine (?) Kammerling et al. (1990) Saxony, Germany Not reported Wittern (2001) Niigata Prefecture...(~40–80 μm diameter), formed of concentric layers of quartz, chalcedony, and opal-A, within a silica Figure |  | | Book (edition) | | prase, and as macroscopic inclusions in sagenitic quartz and other gemties bar. accidental pearl. Genuine...of fused crystalline alum- Quartz which has than 573C. in alpha quartz. formed at less veins, geodes...and large pegma- (Dana). Includes most of the quartz cut as gems. Atomic structure varies as temperature...there is a distinct and permanent change to beta quartz. Wild states that most fired amethysts change...or 300 up to about 573 when they change to topaz quartz. Other authorities with less practical experience |  | | Book | | Spinel Beryl The Garnet Group Tourmaline and Zircon Quartz, Agate and Chalcedony Opal Peridot, Sinhalite,...group G. Topaz and tourmaline H. Zircon I. Quartz group J. Opal K. Chalcedony group L. Jade...‘trigons’ 12. Group of beryl crystals 13 a. Group of quartz crystals 13b. Polished section of agate 14. Fluorspar...(‘made’) in diamond 116 123 17(1). Diagrams of quartz crystals: (a) simple form showing horizontal striations...rock consists chiefly of translucent, nearly white quartz grains, together with dark grains of minerals containing |  | | Book (edition) | | Press Ltd, Southwick, Sussex, and printed in West Germany by Druckerei Georg Appl, Wemding Contents 7...DESCRIPTION OF GEMSTONES Diamond 70 Spodumene 114 Ruby 82 Quartz group 116 Sapphire 86 Jade 154 Emerald 90 Peridot...Obsidian Fine Chinese jade Pyrite Green aventurine quartz Cinnamon stone Colorado ruby Coral agate Craquelees...Trigonal Agate Amethyst Aventurine Benitoite Blue quartz Calcite Chalcedony Chalybite Chrysoprase Citrine...Prasiolite Proustite Quartz Quartz cat's eye Rhodochrosite Rock crystal Rose quartz Ruby Sapphire Sard |  | | Book | | terms applied to jasper, agate, and other forms of quartz, as well as opal. Non-English terms commonly used...can be assigned. For example, granite must have quartz and potassic feldspar, syenite must have potassic...limestone must have calcite, sandstone must have quartz, and so on. Characterizing accessory minerals (and...hornblende syenite, bituminous limestone, siliceous (quartz) dolomite, glauconitic sandstone. Other minerals...mixed with ordinary sediments such as detrital quartz, calcite, and clay minerals. Rocks as well as minerals |
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