The fluorites, pink quartzes, even the delicate greens of some spodumene, the faintly blushing calcites and the rhodochrosites, also sensibly succumb to these exposures, while it is a matter of common annoyance to find that the realgars, cerargyrites,
proustites, cuprites, crocoite, and sulphurs go through changes that slowly alter their substance, texture and appearance.
20, D-53227 Bonn, Germany), there is hope, after all, for major improvement in the
proustite specimens which have been trickling for several years now from the famous Imiter silver mine near Ouarzazate, Morocco.
The specimens are cheap to buy but are very aesthetic, not lightly to be dismissed even by those whose tastes run more to
proustite and phosphophyllite.
The main sulfide minerals are pyrite, galena, sphalerite and chalcopyrite, and much less commonly tetrahedrite and silver sulfosalts (pyrargyrite,
proustite and polybasite).
1506
Proustite, O'Brien mine, Cobalt, Ontario, Canada, no.
At Tamdrost
proustite occurs in calcite veins as dark red crystals not exceeding 4 mm, with lollingite and native silver.
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 ...
5 ("Mexico II"); the 7-cm cluster of
proustite crystals from Chanarcillo, Chile; the finest extant specimen of spangolite from Bisbee, Arizona; and others almost as well known.
Many cases at the Main Show tackled South American Minerals, the hands-down best of them being the Smithsonian's case, with 21 amazing pieces including a totally gemmy blue 5-cm euclase crystal from Ouro Preto, Minas Gerais, Brazil; a single, thick, lustrous, still-red
proustite crystal 9.5 cm long from Chanarcillo, Chile (a gift from J.
Any of the rarer species from Silvermines such as jordanite,
proustite, tennantite etc.
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.