Hornblende, Ottawa
Hornblende is a complex inosilicate series of minerals. It 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. Hornblende minerals are common in igneous and metamorphic rocks.
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Keywords: amphibole, amphibolite, amphibolites, black, calcium-magnesium-iron, color, composition, crystal, dark, double-chain, ferrohornblende, formation, green, group, high-temperature, hornblende, hornblendite, identification, igneous, inosilicate, magnesiohornblende, metamorphic, mineral, monoclinic, ottawa, plutonic, rock, rocks, silicate, silicates, specimen, system, ultrabasic
