Formula: As2(Se,S)3
Origin of name: For Davis Lapham, American mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Dark red
Diaphaneity: Translucent to nearly opaque
Luster: Resinous
Habit: Crystals tabular, euhedral or partially resorbed
Hardness: 1
Specific gravity: 4.5
Cleavage: 1; {010} perfect
Tenacity:
Streak: Red-orange
Synonyms/varieties:
Comments:
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