Calcite on Fluorite

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.

Fluorite – CaF₂

Elements: Calcium, Fluorine

Class: Halides

Crystal System: Cubic

Hardness: 4

Fluorite

Talc (1)Diamond (10)

Softer than glass. A steel knife scratches it.

Origin: Melchor Muzquiz, Coahuila – Mexico

More minerals containing Oxygen