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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
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.
Cummingtonite
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Cummingtonite is a metamorphic amphibole with the chemical composition 25Si8O222, magnesium iron silicate hydroxide.
Cummingtonite
Fibrous, brownish crystals of cummingtonite – Locality: Dannemora Mine, Uppsala Län, Uppland, Sweden
Fibrous, brownish crystals of cummingtonite – Locality: Dannemora Mine, Uppsala Län, Uppland, Sweden