Objects

Displaying 301 - 400 of 40190
Cat. # Name Description
301 00.2.10.163.0003 Calcite Modified rhombic crystals.
302 00.2.10.163.0006 Millerite Sprays of crystals in large calcite crystals.
303 00.2.10.164.0005 Calcite Geode with pyrite crystals with 2 particles of bitumen.
304 00.2.10.165.0002 Calcite Pocket within calcareous tufa.
305 00.2.10.175.0002 Calcite From a seam of coal; Iron pyrite stain on one side.
306 00.2.10.177.0001 Calcite Crystal aggregate.
307 00.2.10.177.0002 Calcite Fragment of calcite geode lined with rhomboidal crystals of calcite.
308 00.2.10.177.0003 Calcite Cleavages.
309 00.2.10.177.0005 Calcite Limestone bearing calcite crystals.
310 00.2.10.177.0007 Calcite Carboniferous; Calcite crystals.
311 00.2.10.177.0008 Calcite Satin spar.
312 00.2.10.177.0009 Calcite Satin spar.
313 00.2.10.177.0011 Calcite None
314 00.2.10.177.0012 Talc None
315 00.2.10.177.0015 Gypsum Translucent, blocky crystal group.
316 00.2.10.187.0002 Marble Smoky
317 00.2.10.189.0003 Barite Pinkish blades on dark calcite matrix with clear calcites.
318 00.2.10.189.0004 Calcite Crystals.
319 00.2.10.189.0005 Calcite Crystals.
320 00.2.10.189.0007 Marcasite None
321 00.2.10.189.0008 Galena Galena with quartz crystals.
322 00.2.10.562.0012 Columbite (Tantalite group) This number has not been assigned a location in the catalog (number not found in catalog).
323 00.2.11.0011 Goethite Color: BK
324 00.2.11.11.0011 Goethite Dull, stalactitic. Color: BK
325 00.2.11.243.0004 Quartz Granitoid quartz and mica.
326 00.2.11.250.0004 Marcasite Marcasite & calcite crystals in small vug.
327 00.2.11.253.0001 Calcite Very large and heavy; crystalline.
328 00.2.11.254.0005 Quartz Quartz porphyry, var. Microgranite.
329 00.2.11.262.0005 Talc Talc schist.
330 00.2.11.264.0001 Hematite Crystals, 1/2" - 1/4", on matrix (after magnetite). Color: BK
331 00.2.11.264.0003 Carnotite Yellow coating.
332 00.2.11.264.0004 Perthite (Feldspar group) Pethite, a microcline - albite - perthite. Also monoclinic.
333 00.2.11.264.0005 Chrysocolla Massive. Color: GR
334 00.2.11.264.0008 Stannite Small, dark gray crystals.
335 00.2.11.264.0009 Stannite Massive dark gray rock (broken in half).
336 00.2.11.268.0012 Calcite Fragment of geode. This number not found in the catalog.
337 00.2.11.283.0001 Heubnerite Crystals in quartz.
338 00.2.11.283.0005 Jamesonite Gray, fibrous; other piece - shiny, brown (looks like road tar)
339 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.
340 00.2.13.0505 Copper Not found in catalog.
341 00.2.13.500.0006 Pyrite Pyrite in black tourmaline.
342 00.2.13.500.0008 Calcite With iron disseminated, decomposed marcasite present
343 00.2.13.500.0014 Feldspar None
344 00.2.13.501.0006 Carnallite None
345 00.2.13.501.0014 Wolframite None
346 00.2.13.504.0004 Pyrite Granular aggregates (ore). ! thumbnail with quartz.
347 00.2.13.504.0006 Quartz, amethyst None
348 00.2.13.512.0008 Quartz, geode Fragment.
349 00.2.13.513.0003 Sphalerite Hand- nice black crystal cluster. Miniature - calcite cleavage fragment Color: BR
350 00.2.13.528.0001 Quartz None
351 00.2.13.528.0002 Quartz None
352 00.2.13.528.0004 Feldspar Oligoclase.
353 00.2.13.528.0005 Feldspar Oligoclase.
354 00.2.13.528.0007 Calcite Calcite. Dysaralite.
355 00.2.13.530.0003 Vesuvianite None
356 00.2.14.638.0010 Pyrite Concretions, some decomposition similar to 00.2.1.602 (CS 428 4).
357 00.2.14.696.0020 Sphalerite Massive sphalerite cementing pieces of matrix. Color: BR
358 00.2.14.697.0020 Quartz, geode Quartz geode lined with botryoidal chaldedony.
359 00.2.14.697.0022 Calcite Grotesque argillo calcareous concretion.
360 00.2.14.697.0023 Calcite Argillo-calcareous concretions.
361 00.2.14.697.0024 Limonite One-half large concretion. Color: BR
362 00.2.14.697.0027 Hematite Variety martite; shows octahedrons clearly. Color: BR
363 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."
364 00.2.15.297.0005 Marcasite Nodule.
365 00.2.15.297.0009 Pyrite Interesting cluster of darkened crystal cubes.
366 00.2.15.298.0003 Quartz, geode Bitumen, bearing geode.
367 00.2.15.298.0007 Quartz Quartz, geode. Peculiarly encrusted crystals.
368 00.2.15.299.0003 Marcasite Nodule.
369 00.2.15.303.0003 Barite Barite/sandstone rose.
370 00.2.15.304.0001 Calcite Concretion about a root
371 00.2.15.304.0003 Calcite Vein, in coal.
372 00.2.15.304.0004 Calcite Vein filling.
373 00.2.15.304.0009 Gypsum Concretion.
374 00.2.15.306.0002 Bournonite Massive, metallic luster; dark gray with pyrite.
375 00.2.15.306.0006 Hematite Botryoidal. Color: RD-BR
376 00.2.15.307.0008 Marcasite Nodule.
377 00.2.15.309.0009 Limonite Fibrous.
378 00.2.15.318.0008 Copper Quartz.
379 00.2.15.318.0009 Copper Native copper.
380 00.2.15.318.0014 Copper Native copper.
381 00.2.15.327.0003 Calcite [Cephenomenal boulderet.(original catalog description)] Calcite crystals with vitreous encrustation on dark massive limestone/dolomite. Color: ML
382 00.2.15.328.0001 Pyrite Iron pyrites, fossil?
383 00.2.15.330.0001 Quartz Illustrative materials.
384 00.2.15.330.0002 Quartz Geodes.
385 00.2.15.330.0005 Dolomite White dolomite crystals covering specimen.
386 00.2.15.330.0008 Dolomite None
387 00.2.15.330.0009 Dolomite None
388 00.2.15.330.0010 Dolomite None
389 00.2.15.330.0011 Barite Misidentified as dolomitic material.
390 00.2.15.330.0012 Barite Misidentified as dolomitic material.
391 00.2.15.331.0002 Wulfenite None
392 00.2.15.331.0003 Scheelite Pale gray, massive.
393 00.2.15.331.0007 Wulfenite Small, golden cubes in vugs.
394 00.2.15.331.0008 Heulandite None
395 00.2.15.331.0009 Nickeline Massive. Color: PK-OR
396 00.2.15.331.0011 Diopside (Pyroxene group) Pyroxene, var. Diopside.
397 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.
398 00.2.15.331.0013 Aragonite None
399 00.2.15.331.0015 Aragonite Twinned crystals.
400 00.2.15.331.0016 Realgar Massive on matrix, glassy coating. Color: RD
CSV