AT A GLANCE
Diaphaneity:
Refractive Index:
Luster:
Mohs Hardness:
Semitranslucent – Opaque
1.500
Vitreous
5.0 – 6.0
MORE INFORMATION
Color Range:
Medium To Dark, Slightly Greenish Blue To Violetish Blue,Mottled With White Calcite And Brassy Pyrite
Major Sources:
Italy, United States, Afghanistan, And Chile