Pyrite -octahedral on Quartz Classic USA
Emma Mine, Butte, Butte District, Silver Bow County
5.4 x 4.3 x 2.7 CM (small cabinet/ large miniature)
Octahedral Pyrite and milky Quartz in a classic combination from Butte. Additional dark sulphides are present but the main feature here is the lustrous Pyrites and elongated Quartz. In excellent condition which is rare in Butte pieces. Butte is one of the worlds greatest mining zones of the 19th and early 20th century. Good specimens are surprisingly rare, this is a nice one ex Les Hitchings collection.
Golden, sharp and brilliant, Pyrites have fully replaced Marcasite crystals and these are well clustered on a series of large Dolomite crystals. Older specimen, ex John Marshall collection, obtained in 1991, there is no sign of instability or other problems as can happen with Pyrite pseudomorphs. A few crystals do have edge chips but most are perfect and complete. Attractive example with textbook twinned crystals from an very interesting, remote location.
An excellent Psuedomorph from Niaca with bright, lustrous metallic gold and silver hues. The condition is excellent and the esthetics are far better than most. These have occasionally been found in this famed mine, but never very many and none for some years.
A Massachusetts rarity, from the John Marshall collection from a one time find over 40 years ago, during the construction of I 495. Two large, complex pyrites to 4.4 CM are perched on a jumble of micro crystals mostly Magnetites with numerous Xenotime. The right side crystal is in perfect condition, the left shows an old stress crack that is partly rehealed. An exceptional example of this find, I have not seen any better ever. Displays well.
well crystallized and classic for the mine this is almost all Pyrite with some Galena matrix. Magnification shows the "ugly grey-black" coatings on the pyrites are micros of Friburgite in "cruller" form with what appears to be Dycrasite. A good reference piece for this prolific mine and not that ugly overall!
Pyrite (striated cubes)
stock #7- AC 180
Huanzala Mine, Huallanca district
Dos de Mayo Province, Huanuco Department,
11.8 x 9.2 CM (cabinet)
An fine, unusual and well balanced older piece from what has become a very famous mine for great pyrites. This form is not like the material that Huanzala has produced for the past decade, this has sharp slightly modified cubes showing pronounced striations. There are many great forms that Huanzala has produced and some fine suites have been developed to showcase them. This would be a fine addition to such a suite, or for any collection of good esthetic minerals. The cubes are sizable, the largest 6.5 CM. Minimal damage, the main crystals are very clean, there is some chipping and periferal damage on the rear and lower areas, despite that it is still very esthetic and presentable.