Objects
Displaying 301 - 400 of 42079
| Cat. # | Name | Description | ||
|---|---|---|---|---|
| 301 | 00.2.11.283.0006 | Melanterite | Melanterite is one of only a few water soluble sulfate minerals. It forms in the near-surface secondary oxidation zone of ore deposits usually late in their development. In many mines, melanterite is an ongoing precipitate or efflorescent forming white to green encrustations, crystal aggregates and stalactites right on the sides of the mine's shafts. The primary source of the iron for melanterite is iron sulfides such as pyrite, pyrrhotite, marcasite and chalcopyrite. A technique for removing copper from the copper sulfate mineral chalcanthite is responsible for the naming of an alternate name for melanterite. Chalcanthite, like melanterite, is soluble in water and it thus makes a solution of copper sulfate. If metallic iron is added to the solution, then metallic copper precipitates, leaving a solution of iron sulfate. This left-over solution has the same composition as a solution made from dissolving melanterite. The alternate name for melanterite is "copperas", from the Greek meaning "copper water", an allusion to the left-over solution. In a way, this could be thought of as "copper-providing water". Attractive crystals of melanterite with a beautiful blue-green color are know to exist and are sought after. The shades toward blue come from impurities of copper which can substitute for as much as one third of the iron. The more copper, the bluer the crystals. Generally melanterite is known as having a white or green color. Melanterite is also the name of a group of only five monoclinic sulfates of which melanterite is the only somewhat common member. Members of this group have the same basic structure as melanterite, but can have in place of iron, ions of manganese, zinc, cobalt and copper. These are the members of the Melanterite Group: Bieberite (Hydrated Cobalt Sulfate), Boothite (Hydrated Copper Sulfate), Mallardite (Hydrated Manganese Sulfate), Melanterite (Hydrated Iron Sulfate), Zinc-melanterite (Hydrated Zinc Copper Iron Sulfate) PHYSICAL CHARACTERISTICS: Color is white, green, yellowish green or blue-green. Luster is vitreous to silky. Transparency: Crystals are translucent to slightly transparent. Crystal Habits include stubby prismatic or blocky to tabular crystals, sometimes as pseudo-octahedrons. Also acicular, fibrous and capillary and found as encrusting, stalactitic and concretionary masses. Cleavage is perfect in one direct but only distinct in another. Fracture is conchoidal. Hardness is 2 Specific Gravity is approximately 1.9 (well below average). Streak is white. Other Characteristics: Is soluble in water and may deteriorate with absorption of water. The taste has a sweet, astringent and metallic character. Associated Minerals are epsomite, chalcanthite, gypsum, pyrite, pyrrhotite, marcasite and chalcopyrite. Notable Occurrences include Minas de Rio Tinto, Spain; Rammelsberg, Harz Mountains, Germany and Falun, Sweden; and in the United States at Ducktown, Tennessee; South Dakota; Colorado; Bigham Canyon, Utah; Comstock Lode, Lincoln County, Nevada; Butte, Montana; at several mines in Arizona and at The Geysers in Sonoma County and at Leona Heights, Alameda County, California. Best Field Indicators are crystal habit, low density, associations, solubility in water, taste and color. |
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| 302 | 00.2.13.0505 | Copper | Not found in catalog. |
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| 303 | 00.2.13.500.0006 | Pyrite | Pyrite in black tourmaline. |
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| 304 | 00.2.13.500.0008 | Calcite | With iron disseminated, decomposed marcasite present |
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| 305 | 00.2.13.500.0014 | Feldspar | None |
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| 306 | 00.2.13.501.0006 | Carnallite | None |
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| 307 | 00.2.13.501.0014 | Wolframite | None |
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| 308 | 00.2.13.504.0004 | Pyrite | Granular aggregates (ore). ! thumbnail with quartz. |
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| 309 | 00.2.13.504.0006 | Quartz, amethyst | None |
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| 310 | 00.2.13.512.0008 | Quartz, geode | Fragment. |
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| 311 | 00.2.13.513.0003 | Sphalerite | Hand- nice black crystal cluster. Miniature - calcite cleavage fragment Color: BR |
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| 312 | 00.2.13.528.0001 | Quartz | None |
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| 313 | 00.2.13.528.0002 | Quartz | None |
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| 314 | 00.2.13.528.0004 | Feldspar | Oligoclase. |
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| 315 | 00.2.13.528.0005 | Feldspar | Oligoclase. |
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| 316 | 00.2.13.528.0007 | Calcite | Calcite. Dysaralite. |
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| 317 | 00.2.13.530.0003 | Vesuvianite | None |
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| 318 | 00.2.14.638.0010 | Pyrite | Concretions, some decomposition similar to 00.2.1.602 (CS 428 4). |
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| 319 | 00.2.14.696.0020 | Sphalerite | Massive sphalerite cementing pieces of matrix. Color: BR |
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| 320 | 00.2.14.697.0020 | Quartz, geode | Quartz geode lined with botryoidal chaldedony. |
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| 321 | 00.2.14.697.0022 | Calcite | Grotesque argillo calcareous concretion. |
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| 322 | 00.2.14.697.0023 | Calcite | Argillo-calcareous concretions. |
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| 323 | 00.2.14.697.0024 | Limonite | One-half large concretion. Color: BR |
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| 324 | 00.2.14.697.0027 | Hematite | Variety martite; shows octahedrons clearly. Color: BR |
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| 325 | 00.2.15.294.0003 | Calcite | Concretions; "From a layer just above ferrous sand running into blue Kansanan Clay, and west up into Iowa ten or more feet above it. Now a line of gravel which I had considered B. G. After a while this calcareous matter moves out and underated layers of for. sand takes its place." |
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| 326 | 00.2.15.297.0005 | Marcasite | Nodule. |
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| 327 | 00.2.15.297.0009 | Pyrite | Interesting cluster of darkened crystal cubes. |
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| 328 | 00.2.15.298.0003 | Quartz, geode | Bitumen, bearing geode. |
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| 329 | 00.2.15.298.0007 | Quartz | Quartz, geode. Peculiarly encrusted crystals. |
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| 330 | 00.2.15.299.0003 | Marcasite | Nodule. |
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| 331 | 00.2.15.303.0003 | Barite | Barite/sandstone rose. |
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| 332 | 00.2.15.304.0001 | Calcite | Concretion about a root |
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| 333 | 00.2.15.304.0003 | Calcite | Vein, in coal. |
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| 334 | 00.2.15.304.0004 | Calcite | Vein filling. |
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| 335 | 00.2.15.304.0009 | Gypsum | Concretion. |
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| 336 | 00.2.15.306.0002 | Bournonite | Massive, metallic luster; dark gray with pyrite. |
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| 337 | 00.2.15.306.0006 | Hematite | Botryoidal. Color: RD-BR |
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| 338 | 00.2.15.307.0008 | Marcasite | Nodule. |
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| 339 | 00.2.15.309.0009 | Limonite | Fibrous. |
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| 340 | 00.2.15.318.0008 | Copper | Quartz. |
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| 341 | 00.2.15.318.0009 | Copper | Native copper. |
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| 342 | 00.2.15.318.0014 | Copper | Native copper. |
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| 343 | 00.2.15.327.0003 | Calcite | [Cephenomenal boulderet.(original catalog description)] Calcite crystals with vitreous encrustation on dark massive limestone/dolomite. Color: ML |
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| 344 | 00.2.15.328.0001 | Pyrite | Iron pyrites, fossil? |
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| 345 | 00.2.15.330.0001 | Quartz | Illustrative materials. |
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| 346 | 00.2.15.330.0002 | Quartz | Geodes. |
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| 347 | 00.2.15.330.0005 | Dolomite | White dolomite crystals covering specimen. |
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| 348 | 00.2.15.330.0008 | Dolomite | None |
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| 349 | 00.2.15.330.0009 | Dolomite | None |
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| 350 | 00.2.15.330.0010 | Dolomite | None |
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| 351 | 00.2.15.330.0011 | Barite | Misidentified as dolomitic material. |
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| 352 | 00.2.15.330.0012 | Barite | Misidentified as dolomitic material. |
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| 353 | 00.2.15.331.0002 | Wulfenite | None |
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| 354 | 00.2.15.331.0003 | Scheelite | Pale gray, massive. |
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| 355 | 00.2.15.331.0007 | Wulfenite | Small, golden cubes in vugs. |
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| 356 | 00.2.15.331.0008 | Heulandite | None |
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| 357 | 00.2.15.331.0009 | Nickeline | Massive. Color: PK-OR |
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| 358 | 00.2.15.331.0011 | Diopside (Pyroxene group) | Pyroxene, var. Diopside. |
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| 359 | 00.2.15.331.0012 | Aragonite | 277 Aragonite CaCO3, Cianciana, Sicily, Foote, Philad'a. Label says dana 814 Scheelite, Tetragonal, Ca WO4, Zinnwald, bohemia. Card says Dana 814, Ward, Tetragonal, scheelite, Ca WO$, Zumwald, Bohemia see 331-13. |
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| 360 | 00.2.15.331.0013 | Aragonite | None |
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| 361 | 00.2.15.331.0015 | Aragonite | Twinned crystals. |
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| 362 | 00.2.15.331.0016 | Realgar | Massive on matrix, glassy coating. Color: RD |
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| 363 | 00.2.15.334.0004 | Garnet group | Color: YL |
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| 364 | 00.2.15.334.0010 | Almandine (Garnet group) | Crystals in nephelite - syenite matrix. Color: RD BR |
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| 365 | 00.2.15.696.0007 | Calcite | Catalog says "Two cards present. One says: Drusy surface of carboniferous limestone, Mahaska Co., Iowa. The other says: dogtooth spar on iridescent surface of limestone." |
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| 366 | 00.2.15.696.0019 | Copper | None |
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| 367 | 00.2.15.696.0020 | Sphalerite | Massive sphalerite cementing pieces of matrix. Color: BR |
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| 368 | 00.2.2.560.0004 | Pyrite | Similar to 00.2.1.602 but listed in old notebook as "astrocarpus" ??? |
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| 369 | 00.2.2.562.0012 | Columbite (Tantalite group) | Massive. Color: BK |
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| 370 | 00.2.2.563.0004 | Enargite | Dark gray, massive. |
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| 371 | 00.2.2.563.0013 | Autunite | Yellow flat crystals scattered on matrix. |
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| 372 | 00.2.23.700.0001 | Calcite | Geode. |
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| 373 | 00.2.23.700.0004 | Skutterudite | Massive. Color: SL-YL |
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| 374 | 00.2.23.700.0006 | Skutterudite | Massive; var. smaltite. Color: SL-YL |
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| 375 | 00.2.23.705.0012 | Nickeline | Massive. Color: YL |
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| 376 | 00.2.23.705.0019 | Muscovite | Microcrystalline. Color: YL |
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| 377 | 00.2.23.705.0024 | Siderite | None |
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| 378 | 00.2.23.705.0029 | Barite | Massive, pink. |
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| 379 | 00.2.23.706.0006 | Muscovite | Muscovite mica. |
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| 380 | 00.2.23.707.0012a | Gypsum | Curved crystal groups on matrix, selenite. |
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| 381 | 00.2.23.708.0006 | Pyrite | Stalactite |
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| 382 | 00.2.23.708.0007 | Pyrite | Stalactite |
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| 383 | 00.2.23.708.0008 | Pyrite | Stalactite |
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| 384 | 00.2.23.708.0009 | Pyrite | Stalactite |
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| 385 | 00.2.23.708.0010 | Pyrite | Stalactite |
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| 386 | 00.2.23.708.0011 | Pyrite | Stalactite |
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| 387 | 00.2.23.708.0012 | Pyrite | Stalactite |
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| 388 | 00.2.23.708.0013 | Pyrite | Stalactite |
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| 389 | 00.2.23.708.0015 | Pyrite | Stalactite |
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| 390 | 00.2.23.708.0016 | Pyrite | Stalactite |
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| 391 | 00.2.23.708.0017 | Pyrite | Stalactite |
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| 392 | 00.2.23.708.0018 | Pyrite | Stalactite |
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| 393 | 00.2.23.709.0010 | Chalcopyrite | Crystals on dolomite crystal matrix. |
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| 394 | 00.2.23.710.0001 | Quartz | Crystals. |
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| 395 | 00.2.23.710.0004 | Quartz | Quartz, rock crystals. |
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| 396 | 00.2.23.710.0007 | Quartz | Botryoidal. Inside of geode. |
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| 397 | 00.2.23.710.0017 | Quartz | Iron, stained quartz crystals. |
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| 398 | 00.2.23.710.0018 | Quartz | Geode. |
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| 399 | 00.2.23.710.0024 | Aragonite | Twinned crystals. |
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| 400 | 00.2.23.714.0001 | Halite | Massive. |
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