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Dominant species
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Indialite
Indialite
Chemical
Formula
Mg2Al4Si5O18
Species
Silicates
Crystal
System
Hexagonal
Mohs
Scale
7
Color
Colourless (thin section).
Luster
Vitreous
Refractive
Index
n = 1.539 n = 1.534
Diaphaneity
Transparent
Crystal Habit:Small hexagonal grains and clusters of spiral-shaped grains, some exhibiting tentacles or multiple terminations.
Geological Setting:Polymetamorphosed pelitic rock (Japan); volcanic eruptive matter (Bellerberg volcano).