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| Grossularite Melanite Leucite Sodalite group Analcite Cristobalite Fluorite Amorphous minerals, glass and cryptocrystalline...Zircon Xenotime Melilite group Si02 group Quartz Chalcedony Tridymite Chabazite Minerals with uniaxial negative...Actinolite Anorthite Apatite Biotite Calcite Chalcedony Chlorite Clinopyroxene Cordierite Epidote Volcanic...opposite is the case if the investigated mineral has a lower refractive index than the material it is surrounded...Table 1 b Q Fig.9 Mineral with higher (a) and lower (b) refractive index relative to its surrounding |
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| its place of formation. A few minerals, such as chalcedony, have a special crystalline structure that does... Figure 2. Quartz from Schmirnerthal, Tirol, Austria. Quartz is often found as crystals. A crystal is...the same type of crystal structure. Quartz and cristobalite, for example, are two minerals with the same...because they con- Figure 4. Chalcedony from the Faeroe Islands. Chalcedony is not crystalline in the normal...from St. Anthony Mine, Mammoth-Tiger 10x 18mm. District, Pinal County, Arizona, USA. Field of view: 33 |
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| 718 GEOLOGY AND ORE DEPOSITS OF THE ' CREEDE DISTRICT, COLORADO BY WILLIAM H. EMMONS AND ESPER S....14 15 15 15 16 17 17 18 General character and occurrence.................................. 18 Petrography...................... 32 General character and occurrence.................................. 32 Contacts...................... 45 General character and occurrence.................................. 45 Thickness.................... 46 Tridymite, quartz, and cristobalite in volcanic rocks................ 47 Chemical |
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| jezioro little, small malý kis. kicsi maty low, lower nízky alacsony niski mine dul bánya kopalnia...little, small mic malý malo. nebagato low. lower jos nízky zapadyna. nyzyna mine mină baňa...noted in the Rodna Mts. (e.g. Bla/na Valley). The Lower Cambrian ore belt, hosted by the Tulgheş Group,...the re gionally metamorphosed formations of the Lower Palaeozoic. The essentially stratiform ore bodies...Sebeş-Lotru Group), the only sig nificant type of occurrence is the graphite deposit at Polovragi in the Parâng |
 | | Journal (article/letter/editorial) |
| combining the commodity (lines) shown by numbers plus lower caps with the host rocks or structure (columns)...Ceriopyrochlore Cerite Cerussite Chabazite-(Ca) Chalcedony Chalcocite Chalcomenite Chalcophanite Chalcopyrite...Zr)(Si2O7)2OF3 Hg2I2 Ag2Hg3 Pb (Zn,Cu)(OH)(VO4) chrom chalcedony Na3Ti3.6 Nb0.4(Si2O7)2O4·4(H2O) KAl2(Si3Al)O10(OH...vapor-derived fluid) of any composition with a density lower than its critical density are involved in the formation...deposits and discussed there. 1b H: A natural green chalcedony whose color comes from chromium is found in Zimbabwe |
| | Journal (article/letter/editorial) |
| combining the commodity (lines) shown by numbers plus lower caps with the host rocks or structure (columns)...Ceriopyrochlore Cerite Cerussite Chabazite-(Ca) Chalcedony Chalcocite Chalcomenite Chalcophanite Chalcopyrite...Zr)(Si2O7)2OF3 Hg2I2 Ag2Hg3 Pb (Zn,Cu)(OH)(VO4) chrom chalcedony Na3Ti3.6 Nb0.4(Si2O7)2O4·4(H2O) KAl2(Si3Al)O10(OH...vapor-derived fluid) of any composition with a density lower than its critical density are involved in the formation...deposits and discussed there. 1b H: A natural green chalcedony whose color comes from chromium is found in Zimbabwe |
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| cave high, height hill lake lillle, small low, lower mine mountai n mountains range or chain open-pi1...cave high. height hill lake lillle. smal l low. lower mine mountain mountains range or chain open-pil...vysoky kopec, vrch jazero maly nizky baila vrch. horn vrchy. hory povrchova jama slil sachta lom rieka...noted in the Rodna Mt . (e.g. Blazna Valley). The Lower Cambrian ore belt. ho ted by the Tulghe~ Group....the re- gionally metamorpho ed formation of the Lower Palaeozoic. The essemially strati form ore bodies |
 | | Book (edition) |
| Tectosilicates Sílica group 261 261 261 Chalcedony 262 Tridymite 264 265 Cristo bali te 266 Opal...the sarne frequency, but shorter wavelength and lower velocity (Eq. 1.1 ). Index of Refraction It is...away from the normal on entering a material with lower refractive index. That the light must be bent on...shorter than À. 1 because the velocity in 2 is lower than in 1. The only way for the wave fronts to be...systems. Minerais in these crystal systems have lower symmetry than those in the isometric system and |
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| of polished agate, showing natural color at the lower end, and on the remainder various artificial colors...fund of information on the subject of agates, chalcedony, and petrified woods, and these chapters were...uartz xiii . . . 13o Contents Agate —Chalcedony Chapter X 157 Chapter XI Geodes and Thunder...Agate-filled Nodule 224 Coral Petrified by Chalcedony 229 Phantom-quartz Crystal 236 Etched-quartz...Old Dexter stamp first of its kind in the Butte district. From then on, his mining properties expanded |
 | | Report (edition) |
| additional occurrences of emerald, opal, agate, chalcedony, organic gems, tiger eye jasper, aragonite, cordierite...6 Feldspar group 65 Feldspar properties and occurrence.............................................................................. 94 Geological occurrence................................................................................ 124 Opaline chalcedony............................................................ 124 Chapter 11 Chalcedony group 125 Chalcedony occurrence and properties............. |
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| from Madagascar|Aquamarine from Pakistan|Chrome chalcedony from Tanzania| Yellow dravite from Tanzania|New...Darren mine located near Ambilobé in the Vohemar District of northern Madagascar. This supplier stated that...331. Chrome Chalcedony from Tanzania Chrome chalcedony is a rare variety of chalcedony that is typically...chrysoprase, chrome chalcedony occurs only in weathered ultramafic rocks. Figure 10: Chrome chalcedony from Tanzania...chrysocolla chalcedony (Frazier and Frazier, 1999), is another rare variety of chalcedony, which is coloured |
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| .............................. 96 Geological occurrence ............................................................................... 120 Opaline chalcedony ................................................................ 121 Chapter 14 Chalcedony group 123 Chalcedony ............................................................... 123 Formation of chalcedony................................................................................. 127 Chrome chalcedony ............................................ |
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| and current status of the world’s only known occurrence of gem-quality red beryl. pg. 299 REGULAR FEATURES...presents an update on the only known commercial occurrence of gem-quality red beryl in the world: the Ruby...the famous Ampandramaika-Malakialina pegmatite district, one of many areas in central Madagascar that...pezzottaite-bearing part of the pegmatite is visible on the lower right (without a significant mine dump below it)...European and American dealers. Additional smaller, lower-quality parcels were sold until September 2003. |
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| Calcite ___________________________________ _ Chalcedony _______________________________ _ Chalcopyrite...Sketch of part of the Dromedary vein showing chalcedony in quartz_______________________________________...the areal geology and studied the mines of the district in 1894, and the accompanying geologic map (pl...been found. The major geologic feature of the district is a body of early Cretaceous granodiorite 5 miles...by various dike rocks. The oldest rocks of the district belong to the Calaveras formation, of Carboniferous |
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| __________________________ 288 Lab Notes A new chalcedony treatment • DiamondView indicates treatment in...strong indicator of HPHT treatment. Concerning the occurrence of the “cage” effect in natural (untreated) diamonds...(Atkinson and Kothavala, 1983). Although the Kashmir district has been at the center of a hostile border dispute...sapphire. Since the mid-1990s, large deposits of lower-quality ruby have been found and worked at Mong...in Bangkok, though the color tended to be much lower in quality than that of traditional Mogok material |
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| mastering the market. Looked at The New York diamond district has long been the center of diamond distribution...five years. This untreated gem still commands much lower prices when compared even to some heat-treated ruby...enabled more merchandise to enter the market and at lower prices. Natural untreated sapphires became more...irradiation, and lowpressure annealing at relatively lower temperatures. Loose stones (0.15–0.33 ct) courtesy...80% of the population feels that they are in the lower middle class, and few feel that they are rich. The |
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| Malyukov and K. Vorobyev Oil and Gas Reservoirs in the Lower Triassic Deposits in the Arctic Regions of the Timan-Pechora...Though values for the favorable feed are marginally lower, nevertheless this difference is expressed in an...and Discussion Pomusovski (Okskii) till in the lower Pechora and Laya is characterized by a low content...fraction of till, which ranges from 0.42% in the lower Pechora River to 0.95% in the Vychegda valley, is...amount of glauconite in Vychegdatill is 3–4 times lower than in Pechoratill: up to 15–20 grains per standard |
