Formula: Ca2Al(PO4)2(OH)
Origin of name: For Peter Bearth, Swiss petrologist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Yellowish, colourless
Diaphaneity:
Luster:
Habit: Prismatic, aggregates, submicron, flat prismatic crystals
Hardness: 5
Specific gravity: 3.25
Cleavage: 1; One poor prismatic
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Soluble in HCl
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