It is a primary ruby deposit. The marble is gray-bluish often with mica (no sphene is found).
Ruby mining takes place in a typical
gwè-dwin scheme reaching over 50 meters in depth.
Diopsides,
scapolites and
spinels are also recovered in the same area.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 238
Gemstone List
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