Formula: Ag2Se
Origin of name: for Karl Naumann, German crystallographer
Crystal system: orthorhombic, pseudocubic
Crystal class: 222
Twinning:
Unit cell: a = 4.333 Å, b = 7.062 Å, c = 7.764 Å
Colour: grayish iron-black, tarnishes to iridescent brownish
Diaphaneity:
Luster: metallic
Habit: crystals cubic, massive granular, thin plates
Hardness: 2.5
Specific gravity: 7.69 to 7.79
Cleavage: none
Tenacity: hackly, sectile and malleable
Streak: iron-black
Synonyms/varieties:
Comments:
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