| | Journal (article/letter/editorial) | of S-E Madagascar Received: 18 August 1994 y Accepted: 12 October 1995 Abstract In Madagascar, hibonite...formations constituting the S-E part of the Island (Tranomaro area). In these skarns, leucocratic segregations...(Anequivalent589–95% which implies T$8508 C), spinel and corundum were formed at stage 1 of metasomatism in a titanite-bearing...T©8008 C. Hibonite crystallized at the expense of corundum and spinel. Expressed as mol% of the CaAl12O19...inclusions in corundum, hibonite and anorthite are composed of nearly pure CO2 . In corundum, the isochores | | Giuliani, Gaston, Groat, Lee, Fallick, Anthony, Pignatelli, Isabella, Pardieu, Vincent (2020) Ruby Deposits: A Review and Geological Classification. Minerals, 10 (7) 597 doi:10.3390/min10070597 | Journal (article/letter/editorial) | Published: 30 June 2020 Abstract: Corundum is not uncommon on Earth but the gem varieties...of ruby and sapphire are relatively rare. Gem corundum deposits are classified as primary and secondary...secondary deposits. Primary deposits contain corundum either in the rocks where it crystallized or as xenocrysts...the Earth’s surface. Classification systems for corundum deposits are based on different mineralogical...magmatic) origin are hosted by alkali basalts (Madagascar and others), and Type IB corresponding to xenocrysts | | | Book | studies, namely ruby, the red-colored gem variety of corundum. The color results from a sufficiency of the trace...Wang, K.; Tarantola, A.; Zaw, K.; Meffre, S. Gem corundum deposits of Greece: Geology, Mineralogy and Genesis...Griffin, W.L.; Saunders, M.; Toledo, V. Chromium in Corundum: Ultra-high Contents under Reducing Conditions...new research territory [8–13]. Research into gem corundum, however, is a continuing process, and new aspects...that determine the spectrum of colors seen in gem corundum shows that their combined individual effects can |
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