Formula: PbBiO2Cl
Origin of name: for Per Geijer, Swedish geologist
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: yellow
Diaphaneity:
Luster: adamantine
Habit: tabular plates, 0.5 mm
Hardness: 3
Specific gravity: 8.16
Cleavage: 1; one perpendicular to c-axis, distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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