AT A GLANCE
Diaphaneity:
Refractive Index:
Luster:
Mohs Hardness:
Transparent – Opaque
1.624 – 1.644
Vitreous
7.0 – 7.5
MORE INFORMATION
Color Range:
Most Commonly Black, But Can Range From Colorless, Brown, Violet, Yellow, Orange, Blue, Red, Green, Pink, Or Bi-Colored, Or Even Tri-Colored.
Major Sources:
Brazil, Nigeria, Madagascar, Kenya, Tanzania, Mozambique, Namibia, Pakistan, Afghanistan, Sri Lanka, And Malawi