Formula: Mn2Al3(SiO4)(Si2O7)(OH)3
Origin of name: from Sursass, Roman name for Oberhalbstein, Switzerland
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: red-brown to copper-red
Diaphaneity: translucent
Luster: silky to somewhat dull
Habit: massive, fibrous
Hardness:
Specific gravity: 3.252
Cleavage: 1; {101} distinct
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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