Zincite & Willemite

Zincite – ZnO

Elements: Zinc, Oxygen

Class: Oxides

Crystal System: Hexagonal

Hardness: 4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Willemite – Zn₂SiO₄

Elements: Zinc, Silicon, Oxygen

Class: Silicates – Nesosilicates

Crystal System: Tetragonal

Hardness: 5.5

Orthoclase

Talc (1)Diamond (10)

About as hard as a steel knife blade.

Origin: Franklin, New Jersey – Usa

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