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,28 ' FLINT GENLfSj Chemical Characters t «• * Before the blow pipe it melts into a greyifh whi^ Veficular enamel. Conjlituent Parts. Tourmaline of Ceylom Of Brazil. Silica 37,0 40,0 Alumina 39,0 39>° Lime 15,0 3J4 Oxyd of iron 9/0 »*>5° ——— of mangartefe 2 ioo 97,34 ' Bergmany Vauquch>'f Phyfical Characters. By fri&ion and heating it exhibits figns of P°^ ltl \ 6 d negative electricity- When it is cooled the & mities change their eleCtricity. When it is he ate pond 2oo° of Fahrenheit, it is deprived of its el £C :al properties 1 The more tranfparent varieties a P tr to polfefs the ftrongeft ele&ricaf properties- Geo.