Mineral - Astrophyllite

Name Astrophyllite
Class Silicates
Category Mineral
Crystal system Triclinic
Chemical composition K₂(Na,Fe²⁺)₇Ti₂Si₈O₂₆(OH)₄
Hardness (Mohs scale) 3 to 4
Transparency Translucent to opaque
Geographical origin Norway, Russia, Canada, United States, Greenland