Arzakite inclusion in Ruby from Mogok
Arzakite Inclusion in Ruby from Mogok. Photo by Bilal Mahmood
Rubies with intense color and high transparency, such as those from the Mogok mining district in Myanmar, form in metamorphosed carbonate platforms during the retrograde metamorphism stage. This occurs at temperatures of ~620°-670°C and pressures of ~2.6-3.3 kbar (V. Gamier et al., "Marblehosted ruby deposits from central and southeast Asia: Towards a new genetic model," Ore Geology Reviews, Vol. 34, 2008, pp. 169-191). The protolith comprises carbonates enriched in detrital Fe-Cr-V-bearing clays, shales with organic matter, and intercalated evaporitic layers.
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