Silver-bearing minerals in the deposit include hessite
crystallizes in cubic symmetry above 149[degrees] C.
This paper underlines the mineralogical characteristics of these deposits by pyrite presence as the main mineral, either disseminated or as sulphur; the absence of arsenopyrite and the occurrence of a variety of minerals such as gold, silver, lead, bismuth and nickel of the telluride's group: Petzite, Calaverite, Silvanite, Hessite
, Bolinskite, Shtiutzite, Melonite, and altaite, as well as the presence of gold of high purity and electrum (Torres et al.
There are several tellurides, (sylvanite, petzite, krennerite, hessite
, and calverite), all of which are alloys of gold, silver, and tellurium.
This preliminary study indicates that the gold occurs as native grains hosted on the surface of, or within fractures in pyrite, basemetal sulfides and hessite
The color photos of specimens are, for the most part, of good quality, as are the specimens themselves (special and super-salivary honors are hereby awarded to the 8-cm hessite
from Botes, Romania on p.
Electron microprobe analysis has shown that the gold and silver-bearing minerals of the vein are the telluride minerals petzite and hessite
, which are inclusions in pyrite.
Stage II includes deposition of milky to smoky quartz, pale purple fluorite, fine-grained pyrite, specular hematite, dolomite or ankerite, celestine, barite, roscoelite, sphalerite, galena, tetrahedrite, calaverite, krennerite, sylvanite, petzite, hessite
, and native gold.
The general hue and cry and the expressions of worshipful awe around those gold cases were just what one would expect, and so, instead of running superlatives predictably around the old track, I will simply say that the major gold cases included the following: Gold Mines of Transylvania (with specimens showing visible crystals of petzite, hessite
and alabandite)--Bill Pinch; a gorgeous case with gold coins, assay scales, books, pictures, etc.
Among the array was a large Kongsberg silver curling around in a hook shape, a fine and rare nagyagite, a similarly rare hessite
, crystalline gold and a fine bournonite from England.
The nodules contain numerous inclusions of other species including hedleyite, joseite, hessite
, electrum and graphite.
Highlights included wonderful thumbnails of Pribram proustite and polybasite; thumbnails of Peruvia n proustite and pyrargyrite; amazing miniatures of Romanian hessite
and nagyagite; acanthites from everywhere; and, best of all (to my taste anyway) a 4 x 6-cm cluster of loosely joined, brilliant spheres of miargyrite crystals from the Little Anna mine in Colorado.