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Hornblende
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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 miner
Hornblende crystal (dark green) about 35 mm long, with apatite (white)
Hornblende crystal (dark green) about 35 mm long, with apatite (white)
Ferrohornblende, near Bilin, Bohemia, Czech Republic
Ferrohornblende, near Bilin, Bohemia, Czech Republic
Hornblende diorite from the Henry Mountains, Utah, US
Hornblende diorite from the Henry Mountains, Utah, US
Ordovician hornblende schist near Marlboro, Vermont. The black sprays are hornblende amphibole.
Ordovician hornblende schist near Marlboro, Vermont. The black sprays are hornblende amphibole.
Amphibole
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Amphibole is a group of inosilicate minerals, forming prism or needlelike crystals, composed of double chain SiO4 tetrahedra, linked at the vertices and generally containing ions of iron and/or magnes
Hornblende
…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. The general formula is (Ca,Na)2−3(Mg,Fe,Al)5(Al,Si)8O22(OH,F)2…
Amphibole (tremolite)
Amphibole (tremolite)
Photomicrographs of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.
Photomicrographs of a thin section containing an amphibole crystal; under cross-polarized light on the left, and plane-polarized light on the right.
Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.
Double-chain inosilicate structure looking up the [100] axis. Silicon ions are hidden by apical oxygen ions.
Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.
Side view (along [010]) of double chain inosilicate backbone. Apical oxygens are at the bottom.