Displaying 201 - 300 of 42096
Cat. # Name Description
201 Pyrite Massive, tarnished.
202 Calcite None
203 Calcite None
204 Calcite None
205 Calcite Crystal.
206 Calcite Crystals.
207 Calcite Dogtooth spar.
208 Calcite Crystals.
209 Calcite None
210 Calcite Crystals.
211 Calcite Crystals.
212 Calcite Book says 20 specimens, but 19 were deaccessioned.
213 Calcite Crystals.
214 Calcite Crystals. Catalog says that specimen was presented by S. H. Bishop.
215 Calcite None
216 Calcite Crystals with hematite crystals.
217 Calcite None
218 Calcite None
219 Calcite Gummed label 1585; book says 11 specimens but 10 of the 11 were deaccessioned.
220 Calcite None
221 Calcite Rhombic spar.
222 Calcite Crystals.
223 Calcite Iceland spar.
224 Calcite Crystals.
225 Calcite Styolitic.
226 Calcite With drusy surface.
227 Calcite Limestone bearing calcite crystals.
228 Gypsum Small seam of clear crystals.
229 Calcite None
230 Calcite None
231 Calcite None
232 Calcite Iridescent.
233 Calcite Rhomb spar.
234 Calcite None
235 Calcite Satin spar.
236 Calcite None
237 Calcite Fibrous. Gummed label 239 3.
238 Calcite Fibrous.
239 Calcite Vein.
240 Calcite Ferruginous.
241 Calcite Limestone pockets bearing calcite crystals.
242 Calcite Crystals in calcite geode.
243 Calcite Geode.
244 Calcite Geode.
245 Calcite Geode.
246 Calcite Geode.
247 Calcite Pirolitic geode.
248 Calcite Calcite crystals in coal.
249 Calcite Bituminous shale matrix; lined with dog-tooth spar.
250 Barite Calcite vein-stuff in carboniferous shale.
251 Calcite Carboniferous shale bearing dog-tooth spar; Catalog says 3 specimens.
252 Calcite Crystals in coal material.
253 Calcite With curved calcite crystals.
254 Calcite Crystals on carboniferous limestone.
255 Calcite Drusy iridescent calcite crystals on black limestone.
256 Calcite Crystals on limestone.
257 Calcite Dog-tooth spar.
258 Calcite Dogtooths spar on carboniferous limestone. Catalog says that this was deaccessioned in 6/93.
259 Calcite Modified rhombic crystals.
260 Millerite Sprays of crystals in large calcite crystals.
261 Calcite Geode with pyrite crystals with 2 particles of bitumen.
262 Calcite Pocket within calcareous tufa.
263 Calcite From a seam of coal; Iron pyrite stain on one side.
264 Calcite Crystal aggregate.
265 Calcite Fragment of calcite geode lined with rhomboidal crystals of calcite.
266 Calcite Cleavages.
267 Calcite Limestone bearing calcite crystals.
268 Calcite Carboniferous; Calcite crystals.
269 Calcite Satin spar.
270 Calcite Satin spar.
271 Calcite None
272 Talc None
273 Gypsum Translucent, blocky crystal group.
274 Marble Smoky
275 Barite Pinkish blades on dark calcite matrix with clear calcites.
276 Calcite Crystals.
277 Calcite Crystals.
278 Marcasite None
279 Galena Galena with quartz crystals.
280 Columbite (Tantalite group) This number has not been assigned a location in the catalog (number not found in catalog).
281 Goethite Color: BK
282 Goethite Dull, stalactitic. Color: BK
283 Quartz Granitoid quartz and mica.
284 Marcasite Marcasite & calcite crystals in small vug.
285 Calcite Very large and heavy; crystalline.
286 Quartz Quartz porphyry, var. Microgranite.
287 Talc Talc schist.
288 Hematite Crystals, 1/2" - 1/4", on matrix (after magnetite). Color: BK
289 Carnotite Yellow coating.
290 Perthite (Feldspar group) Pethite, a microcline - albite - perthite. Also monoclinic.
291 Chrysocolla Massive. Color: GR
292 Stannite Small, dark gray crystals.
293 Stannite Massive dark gray rock (broken in half).
294 Calcite Fragment of geode. This number not found in the catalog.
295 Heubnerite Crystals in quartz.
296 Jamesonite Gray, fibrous; other piece - shiny, brown (looks like road tar)
297 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.
298 Copper Not found in catalog.
299 Pyrite Pyrite in black tourmaline.
300 Calcite With iron disseminated, decomposed marcasite present