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n.1.(Min.) A telluride of silver and gold, related to hessite.
References in periodicals archive ?
The two sections were prepared from an Au ore sample consisting of quartz, galena, and minor altaite, hessite, and petzite, a common gold-bearing mineral.
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., 2005; Lopez, 1988; Lopez et al., 1998; Bortnikov et al., 1988).
There are several tellurides, (sylvanite, petzite, krennerite, hessite, and calverite), all of which are alloys of gold, silver, and tellurium.
Petzite and gold, 2.5 inches, from Gold Hill, Colorado.
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., and superb specimens including the famous "tree root" California gold--Wayne and Dona Leicht; twelve tremendous old golds from the Burrage collection--Harvard; Native Elements of the Gold Group--A.
Most of the specimens were, of course, native gold, but one case held examples of minerals that combine gold with other elements; one such specimen was Harvard's petzite on gold, which must be the world's best petzite.