Formula: (K,Na)4Mg2(P2O7).5H2O
Origin of name: Named after the type locality; Arnhem Cave, Windhoek District, Namibia
Crystal system: Hexagonal
Crystal class:
Twinning:
Unit cell:
Colour: White
Diaphaneity:
Luster: Pearly
Habit:
Hardness:
Specific gravity:
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments: Not a valid mineral species
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