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Tremolite
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Tremolite is a member of the amphibole group of silicate minerals with composition Ca2Si8O222. Tremolite forms by metamorphism of sediments rich in dolomite and quartz, and occurs in two distinct form
Tremolite
Tremolite from the Aure Valley, French Pyrenees (size: 8.2 × 6.7 cm)
Tremolite from the Aure Valley, French Pyrenees (size: 8.2 × 6.7 cm)
Crystalline tremolite
Crystalline tremolite
Riebeckite
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Riebeckite is a sodium-rich member of the amphibole group of silicate minerals, chemical formula Na2Si8O222. It forms a solid solution series with magnesioriebeckite. It crystallizes in the monoclinic
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