Formula: Ca3(Mn,Al)2(SiO4)2(OH)4
Origin of name: For Henri Termier, French mineralogist
Crystal system: Tetragonal
Crystal class: 4/m 2/m 2/m
Twinning:
Unit cell: a = 12.39, c = 11.91
Colour: Clove-brown, orange brown
Diaphaneity:
Luster: Vitreous
Habit: Small grains forming aggregates
Hardness:
Specific gravity: 3.34
Cleavage: None
Tenacity: Conchoidal fracture
Streak: White
Synonyms/varieties:
Comments: Structurally related to garnet
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