Formula: FeTe2O5(OH)
Origin of name: For John Mackay, Irish - American mine operator
Crystal system: Tetragonal
Crystal class: 4/m
Twinning:
Unit cell: a = 11.70 Å, c = 14.99 Å
Colour: Yellowish green to brownish green
Diaphaneity:
Luster: Vitreous
Habit: Crystals pyramidal to short prismatic
Hardness: 4.5
Specific gravity: 4.86
Cleavage: None
Tenacity: Conchoidal; brittle
Streak: Pale green
Synonyms/varieties:
Comments:
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