polybasite


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polybasite

[‚päl·i′bā‚sīt]
(mineralogy)
(Ag,Cu)16Sb2S11 An iron-black to steel-gray metallic-looking mineral; an ore of silver.
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The stock held surprises too--I'm still evoking in memory the brilliant metallic black miniature of Mexican polybasite, with a great upstanding crystal of 2.
Soon he began shipping some extraordinary silver mineral specimens back to New York, including the largest and best polybasite specimens known, large clusters of "poker chip" stephanite crystals, fine acanthite specimens and a few very fine pyrargyrite specimens.
24, 1998, the distinct bands of sulphides have now doubled to over 20 centimeters in width and there are an additional four bands of this exceptionally high grade polybasite.
The `Massive Sulphide horizons' consist of bands of one to two centimeter thick aligned laths of polybasite separating half-centimeter bands of limy skarn with small pockets of the sulphide.
During the 1890s and the first few years of the 20th century the Las Chispas mine near Arizpe produced some of the world's finest specimens of polybasite, pyrargyrite and stephanite.
The face on August 16, 1998 has a footwall (right side) of limestone grading to a very rich sulphide polybasite in the central face, which extends nearly to the left wall.
Among exhibitors who put in "general" displays of Canadian minerals were the Canadian Museum of Nature; the Smithsonian; the Rice Northwestern Museum; the American Museum of Natural History; Wendy and Frank Melanson; Rod and Helen Tyson (two wide, very spectacular cases); and the Royal Ontario Museum (viewing this case, we learned that there exist brilliant iridescent specimens of stephanite and polybasite from the Husky mine, Yukon, which are 6 cm across).
Among the best known are the iridescent polybasite and stephanite specimens produced mostly in the 1960's to 1980's, most notably from the Husky mine.
For earlier scoops on the wonderful iridescent stephanite and polybasite crystals collected originally in the late 1970's from the Husky mine near Mayo, Yukon Territory, see my show reports from Tucson 1996 (vol.
The Smithsonian put in a case of very fine Mexican minerals including such things as stibiconite, amethyst, buergerite, malachite pseudomorphs after azurite, danburite, rare wurtzite and polybasite.
The specimens were a roll call of silver species: acanthite, pearceite, pyrargyrite, polybasite and many others.
By species and owner/photographer they are: adamite, Schlepp/Currier; wulfenite, Harter/Scovil; legrandite, University of Arizona/Scovil; polybasite, Wallace/Wilson, and amethyst, Schlepp/Wilson.