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V.—Pleochroism in a Tin-bearing Mineral from Siam
Published online by Cambridge University Press: 01 May 2009
Extract
In 1915 a heavy concentrate of sand from an unknown locality in Siam was submitted to me for identification. The sand consisted of rather coarse grains of a dark mineral, and finer grains of ilmenite, monazite, tourmaline, zircon, and topaz, with some of the same dark mineral as that occurring in coarse grains.
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