Formula: Na4Mn14O27 . 9H2O
Origin of name: After locality; Birness, Scotland
Crystal system: Monoclinic
Crystal class: 2/m
Twinning:
Unit cell: a = 8.54 Ǻ, b = 15.39 Ǻ, c = 14.26 Ǻ, β = 103.2°
Colour: Black
Diaphaneity: Nearly opaque
Luster:
Habit: Minute grains
Hardness: 1.5
Specific gravity: 3.0
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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