Formula: Ag3AuS2
Origin of name: for Willem Uytenbogaardt (1918-?), professor of geology, Technical University of Delft (The Netherlands), prominent ore microscopist
Crystal system: Tetragonal
Crystal class: 4 or 422
Twinning:
Unit cell: a = 9.75, c = 9.85
Colour: gray white (polished section), surface changes rapidly upon exposure to light
Diaphaneity: Opaque
Luster: Metallic
Habit: Blebs to 100 micron, rims on other minerals
Hardness: 2
Specific gravity: 8.45
Cleavage:
Tenacity: Brittle (considerably more than acanthite)
Streak:
Synonyms/varieties:
Comments:
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