Formula: Bi3O(OH)(PO4)2
Origin of name: for K. Petitjean, discoverer of mineral
Crystal system: triclinic
Crystal class: 1
Twinning:
Unit cell:
Colour: white to pale pink, yellow, dark brown
Diaphaneity: transparent to translucent
Luster: vitreous to adamantine
Habit: spherical aggregates and crusts of intergrown tabular crystals to 0.2 mm
Hardness: 4.5
Specific gravity:
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments: soluble in dilute HCl
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