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Chalk turquoise is a white porous turquoise that comes from China. It is stabilized and then dyed, usually into lively shades of color.This natural form of turquoise has the same chemical composition as turquoise but does not contain copper, the element that causes the blue color of naturally occurring blue turquoise. Usually there is a matrix pattern in the stone resembling subtle crackles.. See Also
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RegMar Jewelry Advice
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