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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

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Breccia

Fine-grained rock matrix with suspended larger rock and fragments

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Box hole

A short raise or opening driven above a drift for the purpose of drawing ore from a stope, or to permit access

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Botryoidal

A descriptive term for minerals having the form of a cluster of grapes