![]() NOTE: There are 3 special orientations in which rutile crystals occur. (absorbs blue, transmits and fluoresces red) Red (ruby is Latin for red), may also be pinkish or brownish-red ![]() Is more simply considered a subdivision of the hexagonal crystal system. This will allow more precise comparison of Asian and other ruby fields and assist confirmation of Mogok sources for rubies in historical and contemporary gems and jewelry.*Note: some texts list the crystal system of ruby as trigonal. Our results demonstrate that detailed geochemical studies of ruby suites reveal that V is a potential ruby tracer, encourage comparisons of V/Cr-variation between ruby suites and widen the scope for geographic typing and genesis of ruby. Such values significantly exceed those found elsewhere suggesting a localized geological control on V-rich ruby distribution. Precise LA-ICP-MS analysis of ruby and sapphire from Mogok placer and in situ deposits reveal that V can exceed 5,000 ppm, giving V/Cr, V/Fe and V/Ti ratios up to 26, 78, and 97 respectively. This raises implications for their color quality, enhancement treatments, geographic origin, exploration and exploitation and their comparison with rubies elsewhere. Here, we show that V can dominate chromophore contents in Mogok ruby suites. Trace element and oxygen isotope composition provide genetic signatures for natural corundum and assist geographic typing. A minor ion, V 3+ induces slate to purple colors and color change in some sapphires, but its role in coloring rubies remains enigmatic. ![]() These gemstones are corundum colored by transition elements within the alumina crystal lattice: Cr 3+ yields red in ruby and Fe 2+, Fe 3+, and Ti 4+ ionic interactions color sapphires. Rubies and sapphires are of both scientific and commercial interest. ![]()
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