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Hornblende is a complex series of silicate minerals.[1]
Hornblende is not a recognized mineral in its own right, but the name is used as a general or field term, to refer to a dark amphibole.
It is an isomorphous mixture of three molecules; a calcium-iron-magnesium silicate, an aluminium-iron-magnesium silicate, and an iron-magnesium silicate.
Hornblende has a hardness of 5–6, a specific gravity of 2.9–3.4 and is typically an opaque green, greenish-brown, brown or black color. It is most often confused with the minerals augite and biotite mica, both of which are black and can be found in granite.