Quartz “Herkimer Diamond”

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: Middleville, Herkimer ounty, New York – Usa History: Ex Kay Robertson Collection

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