Cummingtonite is a member of the cummingtonite-grunerite solid solution series which ranges from Mg 7Si 8O 22(OH) 2 for magnesiocummingtonite to the iron rich grunerite endmember Fe 7Si 8O 22(OH) 2. Cummingtonite is used to describe minerals of this formula with between 30 and 70 per cent … Meer weergeven Cummingtonite is a metamorphic amphibole with the chemical composition (Mg,Fe ) 2(Mg,Fe ) 5Si 8O 22(OH) 2, magnesium iron silicate hydroxide. Monoclinic cummingtonite is compositionally … Meer weergeven 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 Meer weergeven Cummingtonite was named after the town of Cummington, Massachusetts, where it was discovered in 1824. It is also found in Sweden, South Africa, Scotland, and New Zealand Meer weergeven • Deer, W.A.; Howie, R.A. & Zussman, J. (1997). An Introduction to the Rock Forming Minerals (2nd ed.). pp. 229–247. • Hurlbut, Cornelius S. & Klein, Cornelis (1985). Manual of Mineralogy (20th ed.). Wiley. ISBN 0-471-80580-7. Meer weergeven Web4 mei 2011 · Tephras from typical calc-alkaline volcanoes contain one or more of the mineral phases orthopyroxene, clinopyroxene, amphiboles (hornblende and cummingtonite), and biotite. Volcanoes that erupt peralkaline magmas may contain sodic phases such as aegirine, riebeckite, ferrohedenbergite, and aenigmatite.

Cummingtonite - Clark Science Center

Webcummingtonite, an amphibole mineral, an iron and magnesium silicate that occurs in metamorphic rocks. For chemical formula and detailed physical properties, see … WebAnthophyllite is one of several minerals referred to as asbestos. Name: From the Latin anthophyllum, meaning clove, in allusion to the mineral’s color. Association: Cordierite, talc, chlorite, sillimanite, mica, olivine, \ hornblende ,” gedrite, magnesio-cummingtonite, garnet, staurolite, plagioclase. Polymorphism & Series: Forms a series ... gets slick crossword

Cummingtonite - chemeurope.com

WebCummingtonite is a late-stage mineral in some intermediate volcanic rocks, primarily gabbros and norites. Rarely found in silicic volcanic rocks. Associated minerals: tremolite, gedrite, garnet, magnetite, chlorite, plagioclase, hornblend, actinolite, quartz, and biotite. Editors: Alyssa Doody (06), Monica Rolls (13) Resources WebMagnesiocummingtonite is the magnesium rich endmember of the cummingtonite series of the amphibole group of minerals, with the following composition: (Mg)7Si8O22 (OH)2. Magnesiocummingtonite is considered to be an aptly named magnesium rich variety of the mineral cummingtonite which has Fe2+ substituting for some of the Mg. WebTremolite is a silicate mineral and member of the amphibole group. Chemical formula is Ca2 (Mg5.0-4.5Fe2+0.0-0.5)Si8O22 (OH)2. A calcium magnesium silicate, tremolite forms a solid-solution series with ferroactinolite, where iron … christmas wreath with timer lights