A Geoscience Digital Image Library

DescriptionCorundum, Al2O3 (aluminum oxide), is a very hard mineral. Its hardness can be partially attributed to the strong and short oxygen-aluminum bonds. This specimen, 2 cm across, is not particularly attractive, although it does show corundum's hexagonal symmetry. Beautiful gem varieties of corundum are ruby and sapphire.
PhotographerNessa Eull. 2001-08-07.
CollectionUniversity of North Dakota Mineralogy Collection.
Key wordscorundum
Tech details261 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number1438