Formula: TlHgAs3S6
Origin of name: for Simon Engel, the son of the mineral's describer
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: red
Diaphaneity: opaque
Luster:
Habit: crystals irregular, to 0.2 mm
Hardness:
Specific gravity: 5.04
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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