Sugilite - KNa₂Fe³⁺₂(Li₃Si₁₂)O₃0

Habit: Light brownish yellow to bright magenta. Crystals, shaped like slender prisms, rare; commonly in interlocking aggregates of subhedral grains, compact to massive. Vitreous luster; transparent to translucent. White streak.

Environment: Found in strata-bound metamorphosed manganese deposits and peralkaline igneous rocks.

Etymology: Named for Professor Ken-ichi Sugi (1901-48), the Japanese petrologist who discovered the mineral.