Name:

corundum

A photo of the mineral corundum

Class:

Oxide/Hydroxides

Chemistry:

Al2O3

Color(s):

red (ruby), blue (sapphire), gray, black, yellow, purple, (just about all colors) streak: white

Hardness:

9

SpecGrav:

3.9 - 4.1

Fracture:

tough

Cleavage:

none

Crystal:

hexagonal

Envronment:

in pegmatites, in contact metamorphics, and in other metamorphic terrains.

Association:

Locals:

|Burma | China | Sri Lanka | NC, Mo., USA |

Misc:

The name comes from the ancient Sanskrit, ≥kuruvinda≤ meaning ≥ruby≤. It is derived from the Tamil ≥kuruntam≤, which also came from the Sanskrit. Do to its hardness it is also used as an abrasive.

Photos
& Locals:

1.) var. ruby, China

2.) var. ruby, China

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