The mining area of Kin has been known since the time of the Burmese kings. Kin is noted for its many illegal mines.
, fewer rubies
, superb quality moonstones
are commonly found at Kin. Radioactive crystals of thorite and pitchblende are reported from Kin and some of them were fashioned into cabochons. Large, high quality blue sapphires are found in the alluvium on the banks at the nearby streams of the Kin River.
Ref: Ted Themelis (2008) Gems and Mines of Mogok, p. 269
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