About Astrophyllite
A rare titanium silicate, forming distinctive golden-brown to bronze starburst or bladed aggregates. It's a stone of self-knowledge and illumination, helping one to see their true potential and navigate spiritual journeys.
Primary Hues
Bronze-Yellow, Golden-Brown, Brown, Reddish-Brown, often in starburst or bladed aggregates
Geological & Scientific Details
Astrophyllite is classified as a inosilicates astrophyllite group mineral which typically crystallizes in the triclinic system. Its chemical formula is (K,Na)3(Fe++,Mn)7Ti2Si8O24(O,OH)7. Common crystal habits include tabular to bladed, radiating, stellate aggregates; lamellar masses.
Key Geological Properties:
- Mineral Category: Inosilicates Astrophyllite group
- Chemical Formula: (K,Na)3(Fe++,Mn)7Ti2Si8O24(O,OH)7
- IMA Symbol: Ast[1]
- Crystal System: Triclinic
- Predominant Geological Color: Golden brown to yellow; rarely greenish
- Crystal Habit: Tabular to bladed, radiating, stellate aggregates; lamellar masses
- Cleavage: Perfect on [001] imperfect on [100]
- Luster: Greasy, pearly, sub-metallic
- Streak: Yellowish brown or white
- Diaphaneity: Translucent to opaque