Formula: (NH4)2Ca(HPO4)2 . H2O
Origin of name: After locality; Mundrabilla Station, Western Australia
Crystal system: Monoclinic
Crystal class: 2 or m or 2/m
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity:
Luster: Earthy
Habit: Powder
Hardness: 1
Specific gravity: 2.05
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments: Dimorphous with swaknoite
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