Hornblende

[hɒ:nblend]

Definition

(noun.) a green to black mineral of the amphibole group; consists of silicates of calcium and sodium and magnesium and iron.

Inputed by Bertha--From WordNet

Definition

(n.) 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 characterized by its containing considerable iron. Also used as a general term to include the whole species.

Inputed by Conrad

Definition

n. a mineral of various colours found in granite and other igneous rocks that contain quartz.

Edited by Barton