Formula: Pb5(CrO4)2(PO4)2 . H2O
Origin of name: For Peter Embrey English mineralogist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 9.76 Ǻ, b = 5.64 Ǻ, c = 7.14 Ǻ, β = 103.1°
Colour: Orange
Diaphaneity:
Luster: Dull to resinous
Habit: Crystals tabular, minute in drusy crusts
Hardness: 3.5
Specific gravity: 6.45
Cleavage: None
Tenacity: Irregular; brittle
Streak: Yellow
Synonyms/varieties:
Comments:
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