Hornblende

Posted on September 19, 2006 by geo3

Hornblende is a common member of the amphibole group. It can be told from pyroxene by cleavage and is found in igneous and metamorphic rocks. It has the formulae (Ca,Na)2-3(Mg,Fe,Al)5(Al,Si)8O22(OH) 2 and a relative hardness of 6.

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