Formula: NaFe3Si8O20(OH)2.5H2O
Origin of name: after locality Tuperssuatsiait Bay, Greenland
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: red-brown
Diaphaneity: transparent
Luster: vitreous
Habit: fine fibers in fan-shaped aggregates or rosettes to 1 cm
Hardness:
Specific gravity: 2.28
Cleavage:
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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