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Vanadium-rich ruby and sapphire within Mogok Gemfield, Myanmar: implications for gem color and genesis

Citation

Zaw, K and Sutherland, L and Yui, T-F and Meffre, S and Thu, K, Vanadium-rich ruby and sapphire within Mogok Gemfield, Myanmar: implications for gem color and genesis, Mineralium Deposita, 50, (1) pp. 25-39. ISSN 0026-4598 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 Springer-Verlag Berlin

DOI: doi:10.1007/s00126-014-0545-0

Abstract

Rubies and sapphires are of both scientific and commercial interest. These gemstones are corundum colored by transition elements within the alumina crystal lattice: Cr3+ yields red in ruby and Fe2+, Fe3+, and Ti4+ ionic interactions color sapphires. A minor ion, V3+ induces slate to purple colors and color change in some sapphires, but its role in coloring rubies remains enigmatic. Trace element and oxygen isotope composition provide genetic signatures for natural corundum and assist geographic typing. Here, we show that V can dominate chromophore contents in Mogok ruby suites. This raises implications for their color quality, enhancement treatments, geographic origin, exploration and exploitation and their comparison with rubies elsewhere. 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. Such values significantly exceed those found elsewhere suggesting a localized geological control on V-rich ruby distribution. 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. 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.

Item Details

Item Type:Refereed Article
Keywords:ruby, sapphire, color, LA-ICP-MS, vanadium, Mogok, Myanmar
Research Division:Earth Sciences
Research Group:Geology
Research Field:Mineralogy and Crystallography
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Zaw, K (Professor Khin Zaw)
Author:Meffre, S (Dr Sebastien Meffre)
ID Code:98285
Year Published:2015
Web of Science® Times Cited:7
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2015-02-10
Last Modified:2017-11-02
Downloads:0

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