 | | Book |
| 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...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...half of the crystal and another pyramid on the lower half of the crystal, which together form a tetragonal |
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| 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...the Becke line moving into the mineral with the lower refractive index. Through observations of movements |
 | | 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...indigolite, elbaite, dravite, schoerl, achroite Tremolite Triphylite Triplite Troillite Trona Tsumgallite...vapor-derived fluid) of any composition with a density lower than its critical density are involved in the formation |
| | 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...indigolite, elbaite, dravite, schoerl, achroite Tremolite Triphylite Triplite Troillite Trona Tsumgallite...vapor-derived fluid) of any composition with a density lower than its critical density are involved in the formation |
 | | Book |
| prismatic. Fracture: shell-like, uneven to poor. CHALCEDONY Luster: waxy. Hardness: 7. Cleavage: none. Fracture:...perfect cubic. shell-like, brittle. Fracture: CHALCEDONY Luster: waxy. Hardness: Cleavage: GYPSUM ... ZA aX Description of Minerals Actinolite Occurrence: Occurs generally in crystalline schists and...Remarks: A common rock-forming mineral. Albite Occurrence: Occurs in small crystals or, more often...used in the manufacture of ceramics. Analcite Occurrence: Occurs as free-growing crystals or in masses |
 | | Book |
| 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 |
 | | Report (issue) |
| ........ . Quartz monzonite porphyry.·.... . Occurrence and character .... . Petrographic details .....geology-Continued. 9 Epitome of the. geologic history of the 9 district .....•......................... 9 Part II. The... ILLUSTRATIONS. Page. I. Geologic map of the Yerington district, _ Nev ..•........ _.. _.... _.... _. . . In pocket...III. Geologic sections across the. Yerington 28 district; Nev. _. ___ .. __ .... __ . __ .. _. . . IV....Index map showing the location of the Yerington district, Nev......... . . . . . 10 · 2. Geologic section |
| | Book |
| 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 |
 | | Report (issue) |
| THE COPPER DEPOSITS OF THE CLIFTON-MORENCI DISTRICT, ARIZONA BY w-ALDEMAR LINDGREN WASHINGTON GOVERNMENT.... . . . . . . . . . . . . . . . . . . . . 56 Occurrence and distribution . . . . . . . . . . . . . .... . . . . . . . . . . . . . . . . . . . . . . Chalcedony.................................................• _. . Pyroxene ( diopside) and amphibole ( tremolite) _.... _...•... _. .·. _. __ ...... Chlorite ..._. __ . ___ ..... __ ... _.......... _____ ~. _ Lower Liverpool tunnel .. _.. _____ . ___ ......... __ |
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| _____ • _ •• ___ • _ 43 43 44 Rocks containing tremolite and vesuvianite .................................................. __ 55 Chemical character of lower part ........................................................ -·- .............. - ........ . 57 Lower magnesian limestone member........................__ .. _._ .. _._ ... ____ ..... ___ ..... _.. 71 Lower member ........................ _. _..... _. _....__ .. __ . ___ ._ ... _._. ___ ......... _.. 77 Lower Cretaceous series ........................... __ |
 | | Report (volume) |
| the copper minerals.......................... Occurrence of the copper minerals.........................the silver minerals.......................... Occurrence of the silver minerals.........................compounds...................................... 135 Occurrence of the lead minerals...........................compounds...................................... 140 Occurrence of the zinc minerals...........................iron minerals............................. 143 Occurrence of the iron minerals........................ |
 | | Book (edition) |
| Tectosilicates Sílica group 261 261 261 Chalcedony 262 Tridymite 264 265 Cristo bali te 266 Opal...Anthophyllite 218 Gedrite 220 222 Cummingtonite-Grunerite Tremolite-Actinolite 223 __,, Hornblende 225 ,, Ox-yhornbknde...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 |
 | | 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............. |
 | | Report (edition) |
| .............................. 96 Geological occurrence ............................................................................... 120 Opaline chalcedony ................................................................ 121 Chapter 14 Chalcedony group 123 Chalcedony ............................................................... 123 Formation of chalcedony................................................................................. 127 Chrome chalcedony ............................................ |
 | | Journal (issue) |
| 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 |
 | | Report (issue) |
| INTRODUCTION. reports are those on the Mercur district, by J. E. Spurr and S. F. Emmons; the Bingham...Bingham The senior author, J3. S. Butler, began district, by J. M. Boutwell, Arthur Keith, and field work on...deposits of Utah in the S. F. Emmons; the Park City district, by J. M. FIELD .WORK AND AUTHORSHIP. summer...author, G. F. Loughlin, began work in the Tintic district in 1911 in collaboration with Waldemar Lindgren...the Tin tic and Thomas ranges, of the Leamington district, and of districts in theW asatch Range. Several |
 | | Journal (issue) |
| 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 |
 | | Report (issue) |
| .......................... . Situation of the district ...................................................................... General geology of the district .......................................................................................... . Occurrence and distribution ..............................40 41 41 4 CONTENTS. General goology of the district-Continued. Structure ........ ~ . . . . . . .... . . . . . . . . . . . . . . . . . . . . . . Chalcedony ........................... : . . . . . . . |
 | | Report (issue) |
| Professional Paper 177 THE GOLD HILL MINING DISTRICT U'TAH BY T. B. NOLAN UNItED STATES GOVERNMI£NT...Correiation of the Carboniferous formations __ Lower Triassic limestones___ _ __________ _ Unconformity...______ ___ ___ ___ _ __ ____ ___ ______ Clifton district _ _ __ History of mining and production__ ___...119 II Mines and prospects-Continued. Clifton district-Continued. Mines and prospects-Continued. Veins...Evans__________ _________________ Willow Springs district. ____ __ _ __ ___ _ ____ ___ History and production_________ |
 | | Journal (issue) |
| 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. |
 | | Book |
| Dr Josef Engemann Moosstraße 145a 5020 Salzburg Austria ngmann-weil@aon.at Chris Entwistle Department of...rest do not really deserve the term ‘precious’ in lower grades. Gemmologists do not recommend using the...this layer indicate that this is an example of chalcedony. Quartz crystals are visible to the naked eye...Archaeologists are more familiar with quartz and chalcedony varieties as these stones were commonly used...vague term ‘prase’ instead of translucent green chalcedony or green jasper. Mineralogically, however, these |
 | | Report (issue) |
| GEOLOGY AND ORE DEPOSITS OF TILE LEADVILLE MINING DISTRICT, COLORADO BY S. F. EMMONS, J. D. IRVING, AND...Petrography _ 25 Stratified rocks _ Sawatch quartzite ("Lower" quartzite) _ _ 25 25 Name _ erosion_ surface on_...fold-fault _ Faults in the eastern part of the district 95 62 Kokomo syncline_ Faults southeast_ of _..._ Leadville 62 the_ Fryer Hill folds _ 62 district _ 95 Warping and drag along normal faults, _ _ _ 96...Vivianite _ 171 Quartz _ Brown iron oxides _ 155 172 Chalcedony and opal _ 155 Jarosite and basic ferric sulphates_ |
 | | Report (volume) |
| viii-ix. The physical geology of the Grand Canon district, by Clarence E. Button, pp. 47-166, pis. x-xxxvi...of'the geology of the Comstock lode and the Wash oe district, by George F. Becker, pp. 291-330, pis. xlvi-xlvii...xviii-xxiii. Abstract of report on'geology of the Eureka district, Nevada, by Arnold Hague, pp. 237-290, pis. xxiv-xxv...of a report on the mining geology of the Eureka district, Nevada, by Joseph Story Curtis, pp. 221-251,...Director Continued. Geology of the Lassen Peak district, by J. S. Diller, pp. 395-432, pis. xlv-li. The |
 | | Report (issue) |
| Tubby Butte ............................ . 98 Occurrence ............................. . 120 Black Pinnacle...Discoveries ............................ . Gold on the lower San Juan .............. . Gold in the Carrizo Mountains................ . Occurrence ............................ . White Mesa copper district .............. :...Holmes, W. H., Geological report on the San Juan district: U. s. Bull. 431, pp. 11-25, 1911. Gaol. and Geog...~Dutton, C. E., Tertiary history of the Grand Canyon district: U.S. Woodruff, E. G., Geology of the San Juan |
