Formula: YPO4 . 2H2O
Origin of name: For A. Church, English chemist
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 5.61 Ǻ, b = 15.14 Ǻ, c = 6.19 Ǻ, β = 115.3°
Colour: Colourless, white, smoky gray
Diaphaneity:
Luster: Vitreous, pearly
Habit: Crystals lath-like, minute; fan-shaped aggregates, rosettes, crusts, spherulites
Hardness: 3
Specific gravity: 3.26
Cleavage: 1; {-101} perfect
Tenacity: Conchoidal
Streak:
Synonyms/varieties: Weinshenkite, rogersite
Comments: Two distinct species with the extensions -(Nd) and -(Y) indicating the predominant rare earth cation in the formula
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