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Borax

A soft monoclinic mineral, 4[Na2B4O5(OH)4.8H2O]

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Brucite

A trigonal mineral with perfect basal cleavage,  Mg(OH)2

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Bog iron

Iron ore formed as the precipitate of usually naturally occurring dissolved iron

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Bromine

Halogen element. A heavy, reddish-brown liquid, volatile at room temperature with a toxic vapour. Symbol, Br