Boron does not occur native, but may be procured as a grey amorphous powder by reduction of boric acid.
KeywordsBoric Acid Closed Tube Cobalt Nitrate Crystalline Limestone Aluminium Silicate
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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© George Allen & Unwin (Publishers) Ltd. 1970