Color is variable from black, brown, gray, orange to yellow. Luster is submetallic to adamantine, greasy or waxy. Crystals are opaque. Crystal Habits include commonly pseudocubic striated crystals. Also found bladed, reniform, granular and massive.
Cleavage is imperfect in one direction.
Fracture is conchoidal. Streak is white to gray. Associated Minerals include chlorite , talc , serpentine , melilite , andradite , nepheline , sphene and leucite . Best Field Indicators are crystal habit, luster, associations, striations and locality.