Astrophyllite

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

Elements: Potassium, Sodium, Iron, Titanium, Silicon, Oxygen, Hydrogen, Fluorine

Class: Silicates – Inosilicates

Crystal System: Triclinic

Hardness: 3

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Origin: Khibny Massif, Kola Peninsula, Murmanskaja, Oblast, Nortern Region – Russia