Colour: Yellow-green, olive-green, brownish.
Chemical composition: (Mg,Fe)2SiO4 magnesium iron silicate.
Crystal system: Orthorhombic; short compact prisms, vertically striated.
Hardness: 6.5-7 (Mohs scale).
Specific gravity: 3.28 - 3.48.
Refractive index: 1.650 -1.703.
Birefringence: +0.036 to +0.038.
Color of streak: White.
Location: Egypt (historical, completely exploted nowadays), Pakistan, Myanmar, EE.UU (Arizona, Hawai), Brazil, Spain, China, Kenya, Sri Lanka.