Emerald on Calcite

Emerald – Be₃Al₂Si₆O₁₈

Elements: Beryllium, Aluminum, Silicon, Oxygen

Class: Silicates – Cyclosilicates

Crystal System: Hexagonal

Hardness: 7.5-8

Topaz

Talc (1)Diamond (10)

Extremely hard. Harder than most gemstones.

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: Chivor Mine, Chivor Municipality Boyacá Department – Colombia

More minerals containing Carbon