tiemannite


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tiemannite

[′tē·mə‚nīt]
(mineralogy)
HgSe A steel gray to blackish-lead gray mineral consisting of mercuric selenide; commonly occurs in massive form.
References in periodicals archive ?
Mercury-selenium relationships in liver of Guiana dolphin: The possible role of Kupffer cells in the detoxification process by Tiemannite formation.
Identification of Tiemannite as a probable product of demethylation of mercury by selenium in cetaceans.
Assays have shown the selenides from the West Vein to be dominated by penroseite and to include clausthalite, tiemannite and naumannite with possible krutaite (although the Cu may be chalcopyrite).
Ramdohr made a detailed structural and microscopic study of the mineral and concluded that copper and cobalt substitute for nickel in the atomic lattice of "blockite." The lead is in clausthalite, the mercury in tiemannite and the PGE in unidentified platinum and palladium selenides.
Hardness: could not be determined because of complex intergrowth with other minerals, but it has a polishing hardness similar to that of chrisstanleyite, greater than that of tiemannite and clausthalite, but lower than that of stibiopalladinite.
Tiemannite, finely intergrown with corderoite, has been verified as black, spongy, crystalline masses to 2 mm from location 1 on the 5,400 bench.