Formula: Bi(Fe,Al)3(PO4)2(OH)6
Origin of name: locality; Eta-Etu, Kivu, Zaire
Crystal system: Hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell: a = 7.015, c = 16.365
Colour: Greenish, greenish white to yellow green
Diaphaneity: Transparent to translucent
Luster: Vitreous - resinous
Habit: Massive
Hardness: 4.5
Specific gravity: 4.37
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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