Prehnite on Epidote

Prehnite – Ca₂Al(Si₃Al)O₁₀(OH)₂

Elements: Calcium, Aluminum, Silicon, Oxygen, Hydrogen

Class: Silicates – Phyllosilicates

Crystal System: Orthorhombic

Hardness: 6-6.5

Orthoclase

Talc (1)Diamond (10)

Scratches glass. Harder than a steel knife.

Epidote – Ca₂(Al₂Fe³⁺)[Si₂O₇][SiO₄]O(OH)

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

Class: Silicates – Sorosilicates

Crystal System: Monoclinic

Hardness: 6-7

Quartz

Talc (1)Diamond (10)

Scratches glass. Harder than a steel knife.

Origin: Diakon, Cercle de Boufalabe – Mali

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