Formula: Hg5-xAg4+xS5-x(Cl,I,Br)4+x
Origin of name: for Pierre Perroud, Swiss mineralogist
Crystal system: orthorhombic
Crystal class: 222
Twinning:
Unit cell:
Colour: bright red
Diaphaneity: transparent
Luster: vitreous to adamantine
Habit: prismatic crystals to 0.07 mm long
Hardness: 1
Specific gravity: 6.92
Cleavage: 1; {100}
Tenacity:
Streak: orange-red
Synonyms/varieties:
Comments:
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