Hausmannite on Manganite & Calcite

Hausmannite – Mn²⁺Mn³⁺₂O₄

Elements: Manganese, Oxygen

Class: Oxides

Crystal System: Tetragonal

Hardness: 5.5

Orthoclase

Talc (1)Diamond (10)

About as hard as a steel knife blade.

Manganite – Mn³⁺O(OH)

Elements: Manganese, Oxygen, Hydrogen

Class: Oxides

Crystal System: Orthorhombic

Hardness: 4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Calcite – Ca(CO₃)

Elements: Calcium, Carbon, Oxygen

Class: Carbonates

Crystal System: Hexagonal

Hardness: 3

Calcite

Talc (1)Diamond (10)

A copper coin can scratch it.

Origin: Wessels Mine, Kalahari Manganese Fields, Norther Cape Province – South Africa

More Oxides