Formula: (NH4)(Mn,Mg,Ca)PO4.H2O
Origin of name: after locality Niah Great Cave, Malaysia
Crystal system: orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: pale orange
Diaphaneity:
Luster:
Habit: crystals to 0.5 mm, in radiating and subparallel clusters
Hardness:
Specific gravity: 2.39
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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