Chemical Composition Aluminum silicate plus iron -- Al2SiO3 + Fe.
Color Reddish brown, pink, yellowish, and greenish
Refractive Index R.I 1.63-1.65. Strongly pleochroic.
Durability Hardness 6.5 to 7.5.
Crystal Structure Orthorhombic
Specific Gravity 3.13-3.17.
Sources / Occurrence Brazil and a few other locations.


 

 

 

 

 

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