Formula: MnSn(BO3)2
Origin of name: after locality Tusion River, Russia
Crystal system: hexagonal
Crystal class: -3
Twinning:
Unit cell: a = 4.787, c = 15.3
Colour: colourless to yellow to yellow-brown
Diaphaneity: transparent to translucent
Luster: vitreous
Habit: crystals tabular, small, lamellar intergrowths
Hardness: 5 to 6
Specific gravity: 4.73
Cleavage: 1; {001} perfect
Tenacity:
Streak: white
Synonyms/varieties:
Comments: isostructural with nordenskiöldine and dolomite
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