Formula: (Ca,Mn,Na)2(Zr,Mn)5(Sb,Ti,Fe)2O16
Origin of name: Named after Urban Hiarne (1641-1724), a pioneer in Swedish geology.
Crystal system: Tetragonal
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell: a = 15.264, c = 10.089
Colour: Bright red
Diaphaneity: Translucent
Luster:
Habit: Subhedral crystals, prismatic
Hardness: 7
Specific gravity: 5.44
Cleavage: None
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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