Formula: Na15Ca6(Fe,Mn)3Zr3NbSi25O73(O,OH,H2O)3(Cl,F,OH)2
Origin of name: Fe-analogue of kentbrooksite
Crystal system: Trigonal
Crystal class: 3m
Twinning:
Unit cell: a = 14.2099, c = 30.06
Colour: Reddish brown, red
Diaphaneity: Transparent
Luster: Vitreous
Habit: Equant grains, pseudo-octahedral
Hardness: 5-6
Specific gravity: 3.06
Cleavage: None
Tenacity: Brittle, uneven
Streak: White
Synonyms/varieties:
Comments:
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