 | | Journal (issue) | | Malagasy lapidary facility • Ruby and sapphire from Colombia • Lavender sugilite with green spots • Paraíba...tourmaline update • “Winebottle” tourmaline • Magnetic hematite imitation • Boulder opal imitations • Concave...single copies or back issues to the Subscriptions Department. To obtain a Japanese translation of Gems & Gemology...scientist, in the mineralogy and petrography department at the Museum of Natural History, Vienna, Austria...and/or K-rich sanidine), zircon, columbite, rutile, hematite (sometimes in solid solution with ilmenite), spinel |  | | Journal (issue) | | discovery in Canada • Gem-quality corundum from Colombia • Emeralds from Madagascar with strong blue/green...After the 2003 Tucson gem shows, the customs department of Madagascar temporarily froze the export of...minerals such as bixbyite, manganese-containing hematite, tridymite, cristobalite, and (rarely) topaz....cristobalite, tridymite), oxide minerals (bixbyite and hematite), GEMS & GEMOLOGY WINTER 2003 Figure 4. This...(for comparison, the organic black shales at Muzo Colombia, thought to be the source of beryllium for the |  | | Journal (issue) | | Coenraads et al. (1990); from the Mercaderes–Rio Mayo area in southwest Colombia, related to northern Miocene...FTIR analysis of samples from Ratnapura revealed hematite, carbon- Figure 2. The UV-Vis-NIR absorption...(Raman) CO2 fluid inclusion (FTIR and Raman) Hematite (FTIR) Deposit Its position near 1006 cm–1 demonstrates...zircon megacrysts from the Mercaderes– Rio Mayo area, South-west Colombia, South America. Ore Geology...study of inclusions in gem corundum from Mercaderes, Cauca, Colombia. Physics and Chemistry of Minerals, Vol |
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