Formula: Bi2(Se,S)3
Origin of name: from Greek para = similar and guanajuatite
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: lead-gray
Diaphaneity: opaque
Luster: metallic
Habit: massive, lamellar or granular
Hardness: 2.5 to 3
Specific gravity: 7.70
Cleavage: 1; {0001} perfect
Tenacity:
Streak: gray, shiny
Synonyms/varieties:
Comments: dimorphous with guanajuatite
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