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1.- Geologic origin of opals deduced from geochemistry
Gemological Institute of America; Santa Monica, CA; USA; United States, 2006
Proceedings of the 4th international gemological symposium and GIA gemological research conference
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2.- RELATIONSHIP BETWEEN NANOSTRUCTURE AND OPTICAL ABSORPTION IN FIBROUS PINK OPALS FROM MEXICO AND PERU
SCHWEIZERBART'SCHE VERLAGSBUCHHANDLUNG (NAEGELE U. OBERMILLER); STUTTGART; DEU; FEDERAL REPUBLIC OF , 2004
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