Chemical Composition A sodium or calcium aluminum silicate.
Color Colorless, yellow, purple, pink.
Refractive Index R.I. 1.54-1.60. Biaxial.
Durability Hardness 6
Crystal Structure Tetragonal
Specific Gravity 2.50-2.78.
Sources / Occurrence Brazil, Tanzania, Burma.

 

 

 

 

 

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