Color is a dark grayish or greenish-brown and dark green. Luster is silky to vitreous. Crystals are translucent to opaque. Crystal Habits include fibrous, lamellar and radiating masses. Twinning is common and is either simple or lamellar.
Fracture is splintery.
Hardness is 5 - 6. Streak is white. Associated Minerals are hematite , hornblende , actinolite and anthophyllite . Best Field Indicators are crystal habit, fracture, cleavage, color, density and hardness.