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From Biology-Online Dictionary | Biology-Online Dictionary
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(Science: chemical) The common black, or dark green or brown, variety of amphibole. (see Amphibole) It belongs to the aluminous division of the species, and is also characterised by its containing considerable iron. Also used as a general term to include the whole species.

(Science: geology) hornblende schist, a hornblende rock of schistose structure.

Origin: g, fr. Horn horn _ blende blende.