Formula: PbAl3(AsO4)2(OH)5.H2O
Origin of name: for Helmut von Philipsborn, German mineralogist
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: grayish green
Diaphaneity:
Luster:
Habit: massive to earthy crusts, fine-grained aggregates
Hardness: 4.5
Specific gravity: 4.33
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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