7 ounces of silver per ton from sulfide, sulfosalt
and native silver bearing veins and vein stockworks similar to those encountered by Alexco.
Luis also offered about 20 superb thumbnails which are probably the world's best-yet specimens of the rare sulfosalt
pearceite--the arsenic analog of polybasite which, like that more common species, is apt to form platy, metallic black crystals grouped in rosette-shaped aggregates.
being) comprised (sic) of galena, sphalerite and a diverse suite of Ag and sulfosalt
minerals in a gangue of siderite, quartz, or calcite.
Today the Butte mines are closed and flooded, but its mineralogical legacy of fine specimens remains--most noteably the copper sulfide and sulfosalt
minerals such as bornite, chalcocite, chalcopyrite, colusite, covellite, digenite, djurleite, and enargite, and other minerals such as barite, pyrite, quartz and silver.
The new Peruvian pearceite specimens which Luis Burillo, Jaroslav Hyrsl, and one or two Peruvian dealers had are quite exciting, being some of the best specimens of the rare silver sulfosalt
1974) A typical sulfosalt
environment: the mineralogy of the Julcani District, Peru.
Others among the widely varied "South American" cases included one full of exceptional native element, sulfide and sulfosalt
specimens from South America (Bill and Carol Smith); a single 35 x 35-cm piece from the great "cranberry tourmaline" find at Brazil's Jonas mine in 1978, half of the specimen being a great glossy quartz crystal, the other half being a jackstraw richness of very red, very gemmy elbaite crystals (Graeber and Himes); and Tom Hughes' case of Peruvian specimens (next door to his very impressive case of self-collected thumbnails from all over the U.
The gold bearing veins at Paciencia are associated with adularia, chalcedony, sulfosalts
and crustiform-colloform textures typical of low sulfidation gold-silver bearing systems that are found elsewhere in northern Chile.
I: Elements, Sulfides, Sulfosalts
, Oxides, 7th edn.
Apart from argentiferous (silver bearing) lead minerals, the district also hosts numerous occurrences and deposits containing silver sulfosalts
and in some cases, native silver," said Nauman of Alexco.
Specifically, there were 17 (mostly oil) paintings of wulfenite, silver sulfosalts
, tanzanite, mining scenes and other subjects by Wendell Wilson; there were 18 glowing acrylic paintings of specimens by Susan Robinson; there were 16 examples of Eberhard Equit's fantastically finely detailed watercolors of (mostly German) mineral specimens in their natural sizes; and there were 21 exquisite watercolor paintings, also natural size, by Hildegard Konighofer of Graz, Austria (who has, by the way, just published a new book of her mineral art).