Formula: Al5Sb3O14(OH)2
Origin of name: After locality; Serra da Mangaheira and Serra das Almas, Bahia, Brazil
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: Colourless, tan, pale violet
Diaphaneity:
Luster: Adamantine
Habit: Water-worn pebbles
Hardness: 9
Specific gravity: 4.89 to 5.46
Cleavage: 1; {100} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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