Ilvaite on Quartz

Ilvaite – CaFe³⁺Fe²⁺₂O(Si₂O₇)(OH)

Elements: Calcium, Iron, Oxygen, Silicon, Hydrogen

Class: Silicates – Sorosilicates

Crystal System: Monoclinic

Hardness: 5.5-6

Orthoclase

Talc (1)Diamond (10)

Scratches glass. Harder than a steel knife.

Quartz – SiO₂

Elements: Silicon, Oxygen

Class: Silicates – Tectosilicates

Crystal System: Hexagonal

Hardness: 7

Quartz

Talc (1)Diamond (10)

Very hard. Scratches glass and steel.

Origin: 2nd Sovetskii Mine, Dalnegorsk – Russia History: Ex Richard A. Kosnar Collection

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