stockwork in siderite and quartz-encrusted cavities, together with acanthite, native silver, barite, kaolinite, and museum-quality specimens of polybasite and stephanite were noted (Jeff Franzen and Ken Watson, pers.
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
In recent years the Fresnillo area has produced remarkable examples of the silver sulfosalts pyrargyrite
, stephanite and polybasite.
Since then Fresnillo has become one of the world's greatest silver districts, and has also yielded superb specimens of crystallized pyrargyrite
, stephanite, acanthite and polybasite.
A spectacular cabinet-size pyrargyrite
crystal cluster from Hartenstein, Saxony rounds out the silver minerals suite.
The Crown Crescent lode in the Emperor mine has yielded very minor amounts of bournonite, pyrargyrite
, proustite and polybasite.
In some cases the rhodochrosite is covered by hemispherical aggregates of black sphalerite to 3 cm in diameter, accompanied by small pyrite and rarely even tiny pyrargyrite
Similar-looking specimens are sometimes labeled proustite, sometimes pyrargyrite
They're all here, in multiple samples ranging in quality from "study grade" to absolutely superb: Freiberg acanthite and stephanite, Schneeberg proustite and erythrite and roselite and uranium-bearing species, Andreasberg pyrargyrite
and dyscrasite and fluorite and pink apophyllite, Siegerland malachite and anglesite and millerite and galena, Schwarzwald fluorite and barite and silver, Obermoschel cinnabar and moschellandsbergite, Ems pyromorphite and cerussite, Johanngeorgenstadt mimetite, Ohrenstock hausmannite, Fichtelgebirge topaz and microcline and herderite, Ehrenfriedersdorf cassiterite and fluorapatite, Ilfeld manganite, Ronneburg whewellite, Hagendorf phosphates .
Rob Lavinsky reports a discovery of yet more superb pyrargyrite
specimens at Fresnillo, Zacatecas, Mexico: a few pieces with transparent blood-red pyrargyrite
crystals to several centimeters across rising from massive white calcite came, in July 2006, from the 450 level on the San Carlos vein.
He also got apophyllite and valencianite from Guanajuato, and had spent a week in Zacatecas (10) buying specimens of proustite, pyrargyrite
, stephanite and native silver.
In the late 1990's, a galena vein with minor pyrargyrite
was worked in neighboring Uncia, on the southeast side of the mountain, and it is possible that such veins were found extensively during the early 19th century but have been obliterated by mining.