Formula: PbFe(AsO4)(OH)
Origin of name: For Olof Gabrielson, Swedish mineralogist
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Black
Diaphaneity:
Luster: Adamantine
Habit: Crystals crude, in masses and aggregates
Hardness: 3.5
Specific gravity: 6.67
Cleavage: None
Tenacity:
Streak: Pale chocolate brown
Synonyms/varieties:
Comments:
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