Gedrite - Mg₂(Mg₃Al₂)(Si₆Al₂)O₂₂(OH)₂

Habit: White, gray, brown or green. Bladed and prismatic crystals or fibrous. Vitreous luster; transparent to translucent. Gray white streak.

Environment: Widespread in medium- to high-grade metamorphic rocks; also occurs in metasomatized contact metamorphic rocks.

Etymology: From its occurrence in the Gèdre area of France, which is in the Pyrenees Mountains, very close to Spain.