Color is white or gray to colorless. Luster is silky. Transparency crystals are transparent to translucent. Also as vein-like masses of parallel fibrous crystals. Cleavage is perfect in one direction.
Fracture is fibrous.
Streak is white. Associated Minerals are borax , colemanite , hydroboracite and other borate minerals. Best Field Indicators are crystal habit, associations, locality, density, unique optical property, and hardness.