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THE Tourmaline as talisman. The Tourmaline is of comparatively modern origin in Europe as far as its use as a precious stone is concerned. It is very remarkable because of its electrical qualities, for when heated one end will become positive and attract straws or ashes, whilst the other end will be [...] 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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