Benitoite - BaTiSi₃O₉

Habit: Sapphire blue, white to colorless or pink; commonly bicolor. Flat prismatic crystals, tabular, triangular or hexagonal in outline. Vitreous luster; transparent to translucent. White streak.

Environment: Occurs in compact granular natrolite veins cutting glaucophane schist interlayered with serpentine.

Etymology: From the type locality, San Benito County, California.