Sometimes George Harlow looks more like a medieval magician than the curator of gems and minerals at the American Museum of Natural History. Sweeping an ultraviolet light wand over a box of rocks in a ...
In this video Derek and I drive all the way up to North Carolina to go hunting for Ruby and Sapphire Corundum crystals at the world famous Propst Farm near Lincolnton, NC. This was my first time ...
THE three works cited below give much new and valuable information concerning the mode of occurrence, the processes of mining, and the uses of corundum. As the mineral is of growing economic value, ...
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