Maelezo: Jiwe la volkeno linalojulikana kama pumice au basalt ya porous, ni aina ya nyenzo za kazi na za mazingira.Ina kadhaa ya madini na microelements, kama vile sodiamu, magnesiamu, alumini, silicon, kalsiamu, titanium, manganese, chuma, nickel, cobalt na molybdenum na kadhalika ...
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