Posts Tagged ‘ potash ’

Tourmaline

September 16, 2009

By precious stones

The tourmaline is a most complex substance; almost every stone obtained has a different composition, some varying but slightly, with mere traces of certain constituents which other stones possess in a perceptible degree. Consequently, it is not possible to give the chemical formula, which might, and possibly would, be found but seldom, even in...
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Tags: boracic acid, cleavage, dichroscope, ferrous oxide, lime, lithia, magnesia, manganous oxide, oxide of aluminium, potash, soda, tourmaline
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