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Silicon dioxide, better known as quartz, is one of the most abundant minerals on Earth. Mineralogists divide quartz into two classifications: crystalline and cryptocrystalline, based on the size of its crystals. Cryptocrystalline is also called microcrystalline quartz....
(2001) Complete Story
Currently identified with love, diamonds are the gemstone of choice in engagement, wedding, and anniversary rings. Contrary to popular belief, we have not always given diamonds as love tokens. That custom results from modern marketing techniques, not ancient traditions....
(2001) Complete Story
Moonstone and sunstone, seemingly opposites because of their names, are in reality closely related members of the feldspar family. Formed when hot magma solidifies underground, feldspar makes up about 60% of the Earth's crust. It's found worldwide in one form or another. Mineralogists have identified at least 40 varieties of feldspar.... (2002) Complete Story