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The traditional classification in the West, which goes back to the ancient Greeks, begins with a distinction between precious and semi-precious; similar distinctions are made in other cultures. In gemology, this optical effect is strictly defined as opalescence which is a form of adularescence. 546 Mining Engineering - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Color Encyclopedia of Gemstones - Free ebook download as PDF File (.pdf), Text File (.txt) or read book online for free. gemstones Cats eye - Free download as Word Doc (.doc), PDF File (.pdf), Text File (.txt) or read online for free. Chronicles a visit to the high desert of eastern Oregon to examine commercial sources of this natural copper-bearing feldspar. Books (new Exotic Gems Vol 4 by Newman) and instrument sales (used equipment listing (PDF), Meiji GEMZ-8TR), special gem study collections, free on-site gemmological services (2 items per visitor), etc.
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