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cummingtonite

cummingtonite A monoclinic, Mg-rich member (Mg,Fe)2(Mg,Fe)5[Si4O11]2(OH,F)2 of the calcium-poor amphiboles, along with grunerite (Mg < Fe) with which it forms a series, similar to anthophyllite–gedrite; sp. gr. 3.1–3.6; hardness 5.5; dark green; occurs in amphiboles and some intermediate igneous rocks.

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"cummingtonite." A Dictionary of Earth Sciences. . Encyclopedia.com. 26 Sep. 2017 <http://www.encyclopedia.com>.

"cummingtonite." A Dictionary of Earth Sciences. . Encyclopedia.com. (September 26, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cummingtonite

"cummingtonite." A Dictionary of Earth Sciences. . Retrieved September 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/cummingtonite

cummingtonite

cummingtonite (kŭm´Ĭngtənīt): see amphibole.

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"cummingtonite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 26 Sep. 2017 <http://www.encyclopedia.com>.

"cummingtonite." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (September 26, 2017). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cummingtonite

"cummingtonite." The Columbia Encyclopedia, 6th ed.. . Retrieved September 26, 2017 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/cummingtonite