boron

A very hard almost colourless crystalline metalloid element that in impure form exists as a brown amorphous powder. It occurs principally in borax and is used in hardening steel. (Source: CED)



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Kasemann SA, Hawkesworth CJ, Prave AR, Fallick AE, Pearson PN 2005. Boron and calcium isotope composition in Neoproterozoic carbonate rocks from Namibia: evidence for extreme environmental change. Earth and Planetary Science Letters 231 (1-2) 73-86