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nature : Na2 [B4O5 (OH) 4] is usually white 8H2O , microstrip light gray, light yellow, light blue or light green. Traces of the white. Monoclinic crystal. Into columnar crystals. Massive ordinary into dense, earthy or shell-like skin. Glass oil sheen or gloss. Density 1.69 ~ 1.72. Hardness 2.0 ~ 2.5. Able to dissolve in water and was weakly alkaline. In the air easily lost part of crystalline water, eventually turned into a white powder. For ceramics, glass and the glaze raw materials, but also for extracting borax and boric acid preparation, such as boron hydride.
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