Formula: Ca2(Mg,Al)(Cr,Al)2(SiO4)(Si2O7)(OH)2.H2O
Origin of name: for V.P. Shuisk, Russian petrologist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: dark brown
Diaphaneity:
Luster: vitreous
Habit: prismatic to fibrous in radiating aggregates
Hardness: 6
Specific gravity: 3.24
Cleavage: 1; {001} perfect
Tenacity:
Streak: greenish brown
Synonyms/varieties:
Comments:
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