Formula: (Mg,Mn)2(Sb,Mn)O4
Origin of name: for Felix Tegengren (1884-1980), a renowned Finlandic-Swedish economic geologist and expert on ore deposits of Sweden and China.
Crystal system: Trigonal, pseudocubic
Crystal class: 3 or 3
Twinning: Individual octahedra consist of 8 twin domains
Unit cell: a = 16.196, c = 14.948
Colour: Deep ruby red, dark red
Diaphaneity: Translucent
Luster: Subadamantine
Habit: Euhedral to subhedral crystals
Hardness: 6-7
Specific gravity: 4.58 (calculated)
Cleavage: None
Tenacity: Conchoidal fracture
Streak: Red
Synonyms/varieties:
Comments:
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