The mineral of black tourmaline is best in China, at also is rare in the world, and the ore of tourmaline contain to measure 99% above, specific weight 2.98--3.20, hardness 7-7.5, chemistry content complicacy, chemistry formula is: NaR3Al6[Si6O18][BO3]3(OH,F)4, contain the iron is many for black, contain Li, Mn, Cs ,is rose or navy blue, contain Mg is brown or yellow, contain Cr is deep green, Be like glass , translucent to tran***rent ,the stone color gorgeous and tran***rent can be used as jewelry, it can adsorbs the small object on two sides ,example for dust, because of this kind of mineral have the hot electricity function , so it have be called tourmaline.
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