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Cummingtonite From Chvaletice, Pardubice, Czech Republic- Collectors Piece, mineral
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Cummingtonite From Chvaletice, Pardubice, Czech Republic- Collectors Piece, mineral
Weight 125g
Size 17cm by 3cm
Thickness 2cm
Cummingtonite is an amphibole and related to anthophyllite. In its fibrous form it is also called asbestos ; compare to amphibole, anthophyllite, asbestos.
Cummingtonite is commonly found in metamorphosed magnesium-rich rocks and occurs in amphibolites. Usually it coexists with hornblende or actinolite, magnesium clinochlore chlorite, talc, serpentine-antigorite minerals or metamorphic pyroxene. Magnesium-rich cummingtonite can also coexist with anthophyllite.
Cummingtonite has also been found in some felsic volcanic rocks such as dacites. Manganese rich species can be found in metamorphosed Mn-rich rock units. The grunerite end member is characteristic of the metamorphosed iron formations of the Lake Superior region and the Labrador Trough. With prograde metamorphism cummingtonite and grunerite morph to members of the olivine and pyroxene series.
Weight 125g
Size 17cm by 3cm
Thickness 2cm
Cummingtonite is an amphibole and related to anthophyllite. In its fibrous form it is also called asbestos ; compare to amphibole, anthophyllite, asbestos.
Cummingtonite is commonly found in metamorphosed magnesium-rich rocks and occurs in amphibolites. Usually it coexists with hornblende or actinolite, magnesium clinochlore chlorite, talc, serpentine-antigorite minerals or metamorphic pyroxene. Magnesium-rich cummingtonite can also coexist with anthophyllite.
Cummingtonite has also been found in some felsic volcanic rocks such as dacites. Manganese rich species can be found in metamorphosed Mn-rich rock units. The grunerite end member is characteristic of the metamorphosed iron formations of the Lake Superior region and the Labrador Trough. With prograde metamorphism cummingtonite and grunerite morph to members of the olivine and pyroxene series.
