Stannite Arsenopyrite and Quartz

Stannite – Cu₂FeSnS₄

Elements: Copper, Iron, Tin, Sulfur

Class: Sulfides

Crystal System: Tetragonal

Hardness: 4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Arsenopyrite – FeAsS

Elements: Iron, Arsenic, Sulfur

Class: Sulfides

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: Yaogangxian mine, Yishang Co. Hunan Prov. – China

More Arsenopyrite specimens