Hessite

Formula:  Ag₂Te

Origin of name:   For Germain Hess, Swiss-Russian chemist

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:   Twin lamellae visible in polished section

Unit cell: a = 8.13 Ǻ, b = 4.48 Ǻ, c = 8.09 Ǻ, β = 112.9°

Colour:  Lead-gray to steel-gray

Diaphaneity: 

Luster:  Metallic

Habit:  Crystals pseudocubic, highly modified, irregular and distorted; massive, compact or fine-grained

Hardness:  2 to 3

Specific gravity:  8.41

Cleavage:  1; {100} indistinct

Tenacity:  Even; sectile

Streak: 

Synonyms/varieties:

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