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Riebeckite
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Riebeckite is a sodium-rich member of the amphibole group of silicate minerals. It has chemical formula Na2Si8O222. It forms a solid solution series with magnesioriebeckite, where Mg substitutes for F
Black riebeckite in an alkaline pegmatite from Lindinosa near Évisa, Corsica, France
Black riebeckite in an alkaline pegmatite from Lindinosa near Évisa, Corsica, France
Crocidolite, variety of riebeckite, from Pomfret Mine, Vryburg, South Africa
Crocidolite, variety of riebeckite, from Pomfret Mine, Vryburg, South Africa
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
Riebeckite
…Riebeckite is a sodium-rich member of the amphibole group of silicate minerals. It has chemical formula Na2(Fe2+3Fe3+2)Si8O22(OH)2. It forms a solid solution series with magnesioriebeckite, where Mg…
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.