Corundum

Corundum

Corundum comes from "corinvindum" so called in 1725 by John Woodward. It is derived from Sanskrit, kuruvinda ("Ruby"). Richard Kirwan used the current spelling "corundum" in 1794. The name probably refers to the great hardness of the mineral

Data

Formula Al2O3 As a raw material: Alumina
Color Blue, red, pink, yellow, gray, golden brown
Shine Adamantine, Glassy, Pearlescent
Hardness 9
Specific Weight 3.98 - 4.1
Crystal Systeem Trigonal
Transparency Transparant, Translucent, Opaque
Location Sri Lanka, France and Myanmar

Corundum was known by many names in ancient times: adamant, sapphire, ruby, hyacinth, asteria, etc.

Polymorph of Deltalumite

Corundum is the aluminum analogue of Eskolaite, Hematite and Karelianite.

The red (Cr-bearing) gemstone is called Ruby. The blue (Fe and Ti bearing) gemstone variety is called Sapphire.

Ordinary Corundum, stones that are not of gem quality are used as a grinding and polishing agent. Well-known grinding material 'smear' consists of fine-grained Corundum with Magnetite, Hematite and Quartz mixed in

The Korund group consists of: Ruby and Sapphire

If in stock you will find my collection of Raw Gemstones below.

Are you looking for cut Gemstones from the Korund Group, look at KORUND GROUP

Active filters