Scientific Name: Enstatite
Group: Silicates – inosilicates
Chemical composition: Mg2Si2O6
Colors: Colorless, yellow, green, brown, or black
Hardness: 5 to 6
Formation: Orthorhombic crystal; massive form.
Principal Sources: India, Arizona, Myanmar and Sri Lanka.
Special Notes: Also used as a refractory to line ovens and kilns.