CAUSE OF RED COLORING IN GEM PLAGIOCLASE FELDSPAR

Andesine and labradorite, members of plagioclase feldspar, may have gemological properties. In the gem market, red gem plagioclases have been sold but they may contain natural and treated stones. Consequently, confusion has been made to both trader and customer. Mechanism and cause of red coloring in gem plagioclase feldspar were then investigated in this study. Two sample groups, natural red plagioclase and red copper-diffused plagioclase were collected for this study. Microscopic examination revealed some typical...
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