Astrophyllite - K₂NaFe²⁺₇Ti₂(Si₄O₁₂)₂O₂(OH)₄F

Habit: Bronze yellow, golden yellow or brown to reddish brown. Blades up to 15 cm long and in stellate aggregates; also foliated or massive. Greasy, pearly submetallic luster; opaque to translucent in thin leaves. Yellowish brown streak.

Environment: Found in nepheline syenites and alkali granites.

Etymology: From the Greek astron, meaning "star," and phyllon, meaning "leaf," referring to its starburst-like sprays and micaceous cleavage.