Formula: (Mn,Ca)(Mg,Fe,Mn)Al(PO4)2(OH) . 4H2O
Origin of name: From locality; Lun'ok River, Russia
Crystal system: Orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: Colourless to white
Diaphaneity:
Luster:
Habit: Radiating aggregates 0.5 - 1 mm
Hardness: 3 to 4
Specific gravity: 2.66
Cleavage: 2; {010} perfect, {001} imperfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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