Rubies are formed of a mineral called corundum, comprised of aluminum oxide. The red color is caused by traces of chromium. Corundum also forms sapphire in many colors, which generally come from ...
The Artstor website will be retired on Aug 1st. The Journal of the Royal Asiatic Society... The Journal of the Royal Asiatic Society of Great Britain and Ireland Vol. 7, No. 2, 1843 Mineral Resources ...
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A blue miracle in the Eifel: How sapphires formed in volcanoesWhy this extremely rare variant of corundum is frequently found in this ... sapphires from the Eifel using the uranium-lead method on mineral inclusions in the sapphire using a secondary ion ...
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