Mesolite on Apophyllite

Mesolite – Na₂Ca₂(Si₉Al₆)O₃₀·8H₂O

Elements: Sodium, Calcium, Silicon, Aluminum, Oxygen, Hydrogen

Class: Silicates – Tectosilicates

Crystal System: Orthorhombic

Hardness: 5

Apatite

Talc (1)Diamond (10)

About as hard as a steel knife blade.

Apophyllite – KCa₄Si₈O₂₀(F,OH)·8H₂O

Elements: Potassium, Calcium, Silicon, Oxygen, Fluorine, Hydrogen

Class: Silicates – Phyllosilicates

Crystal System: Tetragonal

Hardness: 4.5-5

Apatite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Origin: India