Formula: Ag2Sb2(O,OH)7
Origin of name: for Karl Stetefeld, German-American mining engineer (1838-1896)
Crystal system: Isometric
Crystal class: 4/m -3 2/m
Twinning:
Unit cell: a = 10.46
Colour: black, brown, yellowish
Diaphaneity: Translucent to opaque
Luster: Earthy, dull
Habit: massive
Hardness: 3.5 to 4.5
Specific gravity: 4.6
Cleavage: none
Tenacity:
Streak: Yellow
Synonyms/varieties:
Comments:
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