Hessite

(repeating unit)Ag2TeIMA symbolHes[1]Strunz classification2.BA.30cCrystal systemMonoclinicCrystal classPrismatic (2/m)
(same H-M symbol)Space groupP21/cUnit cella = 8.13, b = 4.48
c = 8.09 [Å]; β = 112.9°; Z = 4IdentificationColorLead-grey, steel-greyCleavageIndistinct on {100}TenacitySectileMohs scale hardness2–3LusterMetallicStreakblackDiaphaneityOpaqueSpecific gravity8.24 – 8.45Optical propertiesAnisotropicReferences[2][3]

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

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Webmineral
  3. ^ Mindat.org
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