Formula: Na2Mn5FeAl(PO4)6
Origin of name: For R. Ferguson
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Red-brown to green-brown
Diaphaneity:
Luster: Resinous
Habit: Crystals anhedral, equant to 1 cm long
Hardness: 4
Specific gravity: 3.54
Cleavage: 2; {010} perfect, {100} parting
Tenacity:
Streak: Yellow-brown
Synonyms/varieties:
Comments:
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