Hessite
(repeating unit)Ag2Te IMA symbol Hes[1] Strunz classification 2.BA.30c Crystal system Monoclinic Crystal class Prismatic (2/m)
(same H-M symbol) Space group P21/c Unit cell a = 8.13, b = 4.48
c = 8.09 [Å]; β = 112.9°; Z = 4 Identification Color Lead-grey, steel-grey Cleavage Indistinct on {100} Tenacity Sectile Mohs scale hardness 2–3 Luster Metallic Streak black Diaphaneity Opaque Specific gravity 8.24 – 8.45 Optical properties Anisotropic References [2][3]
(same H-M symbol)
c = 8.09 [Å]; β = 112.9°; Z = 4
Hessite is a mineral form of disilver telluride (Ag2Te). It is a soft, dark grey telluride mineral which forms monoclinic crystals.
It is named after Germain Henri Hess (1802–1850).
Hessite is found in the US in Eagle County, Colorado and in Calaveras County, California and in many other locations.
Stützite (Ag7Te4) and empressite (AgTe) are related silver telluride minerals.
References
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