Formula: (Fe,Mg)2(Mg,Fe)3Si12O30
Origin of name: for mineral collector Walter Trattner, a mineral collector with excellent knowledge of the mineralogy of the area where this mineral was found.
Crystal system: Hexagonal
Crystal class: 6/m 2/m 2/m
Twinning:
Unit cell: a 10.050, c 14.388
Colour: Deep blue to yellowish green
Diaphaneity: Translucent
Luster: Vitreous
Habit: Short to long prismatic crystals to 1mm
Hardness:
Specific gravity: 2.68 (calcuted)
Cleavage: [001] good, [100] poor
Tenacity: Brittle
Streak: White
Synonyms/varieties:
Comments: member of the osumilite group
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