Formula: (NH4,K)(Fe,Al)2(PO4)2(OH).2H2O
Origin of name: named form the order name for penguins
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: brown
Diaphaneity:
Luster: earthy
Habit: fine-grained brown aggregates
Hardness: 1
Specific gravity: 2.71
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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