This paper discusses the types of stones that are categorized under the geological heading of corundum: The ruby and the sapphire.
Written in 1991; 1,125 words; 4 sources; $ 39.95
From the Paper:
"The ruby is one of the two stones categorized under the heading of corundum-- sapphire is the other. Ruby and sapphire may appear to be quite different but are in fact color varieties of the same mineral, chemically and physically the same, differing only in the amount of impurities they contain. It is in fact the chemical impurities that give them their value, for pure corundum is colorless. Corundum is a relatively abundant mineral. It is surpassed only by diamonds in hardness, so tons are mined each year to be used as an abrasive. The hardness contributes as well to the value of the gems consisting of this mineral. Corundum is composed of two light elements, aluminum and oxygen, and the close packing of these elements along with the strong bonding of the atoms are what give the gems their hardness and specific gravity. The ruby and the sapphire have long been prize ... "
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