 | | Journal (article/letter/editorial) | | Nabburg-Woelsendorf district (Fig. 1 c). Investigations of these barite occurrences from the Oberpfalz district were...(1967, 1980). Numerous studies centered on this district are cited in the last mentioned paper. A detailed...composition of barites and other gangue minerals (e.g. strontianite) in Europe and elsewhere have been recorded...area occurs in the Hercynian Mts., which in that region is divisible into the Saxothuringian and Moldanubian...Frankenwald, c) Southern Oberpfalz/Nabburg fluorite district characterized by a preponderance of Variscan |  | | Report (issue) | | Rare-Earth Mineral Deposits of the Mountain Pass District San Bernardino County California GEOLOGICAL SURVEY... Rare-Earth Mineral Deposits of the Mountain Pass District San Bernardino County California By J. C. OLSON...PROFESSIONAL PAPER 261 A geologic study of the district and its rare-earth-bear ing carbonate rocks. One...AT MOUNTAIN PASS, CALIFORNIA By D. F. HEWETT The region near Mountain Pass, San Bernardino County, Calif...In 1854 lead ore was found in the Yellow Pine district (Potosi area) on the west slope of the Spring |  | | Report (issue) | | known at the time of the writer's visit to this region, November 27 to December 8, 1912. One of these...diamonds and the geology of the peridotite in this region, as indicated in the following list: Kunz, G. F...Some facts and corrections regarding the diamond region of Arkansas: Eng. and Min. Jour., vol. 87, 1909...about 2 miles northeast of the earlier-known occurrence and 3 miles from Murfreesboro. One of them, namely...previously been described. TOPOGRAPHY. Much of the region in which the areas here described are located is |  | | Journal (issue) | | knowledgeable about the minerals from this unique occurrence. She was generous with specimens, making many...Van Silver mine, and it is the second reported occurrence in Canada fo r semseyite, miargyrite and pyrostilpnite...River, which drains a large mountainous area. The region is renowned for its scenery, lakes, alpine meadows...northwest of Highway 99. During the colder months the region is covered by a meter or more of snow, restricting...i i l l MB i i i i ........ Ii i i ........ Calcite....................2. 2A j i i ii i i i ... |  | | Book | | the earlier history, indeed the prehistory, of a region. Conglomerates speak of a time when high nearby...of increasing hardness: AMR WN talc . gypsum calcite fluorite apatite 2 CON feldspar . quartz topaz...Cleavage: prismatic. Fracture: uneven to poor. CALCITE Luster: to length of crystals; brittle. Hardness:... 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 |  | | Report (volume) | | ........... Copper deposits of the White Mesa district, Ariz., by J. M. Hill............ Survey publications.....-.... LEAD AND ZINC: Economic geology of the region around Mullan, Idaho, and Saltese, Mont., by F...deposits of the Dome district, Idaho, by J. B. Umpleby.... The Yellow Pine mining district, Clark County, Nev...quadrangle, California...... III. Geologic map of region around Mullan, Idaho, and Saltese, Mont.... ' IV...IV. Sketch map of the Yellow Pine mining district, Clark County, Nev.. V. Map showing relation of outcrops |  | | Book (edition) | | III there is an elementary discussion of the occurrence, This includes a brief descripand association...(Glass and Hydrocarbons) PART 413 III THE OCCURRENCE, ASSOCIATION, AND ORIGIN OF MINERALS A. General...Verlagshandlung, Stuttgart, 1905. PART III THE OCCURRENCE, ASSOCIATION, AND ORIGIN OF MINERALS BECK (WEED):... calcium carbonate in two well-defined forms: calcite and aragonite. Although these have exactly the...determined, there yet remain the facts of its occurrence and association, and the problem of its origin |  | | Book (edition) | | ores-Limonites in swamps and lakes (bog iron ores)-Occurrence -Composition-Origin-Examples- The sidcrites of...of marine and brackish-,vatcr strata - Occurrence- Exiun ples- The oolitic marine iron ores-The hydrous...anhydrite -Occurrence-Uses-Stability and solubility-Sodium carbonate and sodium sulphate-Occurrence-Sodium...m nitrate-BoratesGeneral occurrence-Marine borate deposits-Borax marshesTertiary lake beds-Production...beds-Production and uses-Origin-Sodiurn chloride-Occurrence-Examples-The salt do1nes of the gulf coast-Composition |  | | Book (edition) | | 151 Colemanite 120 The Spinel Group 141 142 Calcite Magnesite 144 Siderite 145 Rhodochrosite 146 Dolomite-Ankerite...Dolomite-Ankerite 147 Aragonite 148 Strontianite 149 150 Witherite Sulfates Pyrite 120 121 Sphalerite... the Nicol prism. The prism is constructed of calcite, which has been cut on the diagonal and glued back...(n = 1.537). Light entering the bottom of the calcite prism is split into two rays ( w and E) that have...by the dashed line. of clear calcite (Figure 1.14 ). A crystal of calcite is cut on the diagonal, as shown |  | | Book (edition) | | Tactics 109 109 Alteration 135 135 137 138 Calcite Magnesite 110 140 141 Siderite 111 Opaque...142 Dolomite- Ankerite 113 Aragonite 145 Strontianite Witherite 9. Native Elements, Sulfides, Halides...the boundary between the balsam cement and the calcite at greater than the critical angle, hence it is...which is constructed of clear calcite (Figure 1.15). A crystal of calcite is shown, and glued back together...detail in Chapters 5 and 6, when light enters the calcite, it is split into two plane polarized rays (w and |
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