Occurs in Pinal County.
Chemical Formula: Mn2+2O3
Specific Gravity: 4.96-5.01
Luster: Submetallic
Hardness: 6-6.5
Bixbyite is a manganese oxide mineral that is known for its striking deep black color and submetallic Luster. It often occurs as small, prismatic crystals and is a minor ore of manganese.
Next Pinal County mineral: Bobmeyerite