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Corundum is an aluminum oxide mineral (Al2O3). The gem varieties of Corundum are Ruby and Sapphire. Ruby is the red variety of Corundum. The red color is caused by traces of chromium replacing aluminum in the crystal structure. Sapphire can be blue, red, pink, yellow, grey, or golden-brown. The most valued color is blue.
Azurite [Cu 3 (CO 3 ) 2 (OH) 2 ] is a copper carbonate mineral. It owes its name to its beautiful azure-blue color,which makes it a very popular and well-known mineral. It usually occurs with green Malachite, whichmay form green stains or specks on Azurite crystals or aggregates. The two minerals sometimes occuradmixed or […]
