The prism faces are usually striated lengthwise. In cross section, all tourmalines will appear predominantly triangular in shape. Doubly terminated crystals are hemimorphic meaning that the two ends of the crystal are not exactly alike. Massive forms can also be found. Cleavage is absent although there is basal parting.
Fracture is uneven to conchoidal.
Streak is white. Associated Minerals include those minerals associated with granitic pegmatites and metamorphic rocks such as micas , feldspars and quartz . Best Field Indicators are crystal habit, overall triangular cross-section, striations, color and hardness.