cummingtoniten.

/ˈkʌmɪŋtənʌɪt/

Etymology: < the name of Cummington, a town in Massachusetts, U.S.A., where it was first found + -ite suffix¹.

Mineralogy.

A basic silicate of magnesium and ferrous iron, (Mg, Fe)₇Si₈O₂₂(OH)₂, that is an amphibole mineral similar to anthophyllite but monoclinic and with more iron, and that occurs as fibres and lamellae in metamorphic rocks.

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > [noun] > others

fluosilicate1817

cummingtonite1824

steenstrupine1882

armenite1940

zussmanite1965

1824 C. Dewey in Amer. Jrnl. Sci. 8 59 Cummingtonite, I have given this name to a mineral found by Dr. J. Porter in Cummington.

1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) III. 623/1 The observed ranges of composition of cummingtonite and anthophyllite overlap considerably... Cummingtonite is optically positive and thus distinct from the other monoclinic amphiboles.

1977 Lancet 9 July 80/2 The Duluth water supply contained mineral fibres resembling asbestos, which were shown to be an asbestos amphibole, cummingtonite-grunerite.

1989 Jrnl. Petrol. 30 42 The occurrence of cummingtonite instead of garnet in the amphibolite is also consistent with low-pressure hornblende-granulite grade metomorphic conditions.

This entry has not yet been fully updated (first published 1997; most recently modified version published online June 2018).

单词	cummingtonite
释义	cummingtoniten. /ˈkʌmɪŋtənʌɪt/ Etymology: < the name of Cummington, a town in Massachusetts, U.S.A., where it was first found + -ite suffix¹. Mineralogy. A basic silicate of magnesium and ferrous iron, (Mg, Fe)₇Si₈O₂₂(OH)₂, that is an amphibole mineral similar to anthophyllite but monoclinic and with more iron, and that occurs as fibres and lamellae in metamorphic rocks. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > [noun] > others fluosilicate1817 cummingtonite1824 steenstrupine1882 armenite1940 zussmanite1965 1824 C. Dewey in Amer. Jrnl. Sci. 8 59 Cummingtonite, I have given this name to a mineral found by Dr. J. Porter in Cummington. 1966 McGraw-Hill Encycl. Sci. & Technol. (rev. ed.) III. 623/1 The observed ranges of composition of cummingtonite and anthophyllite overlap considerably... Cummingtonite is optically positive and thus distinct from the other monoclinic amphiboles. 1977 Lancet 9 July 80/2 The Duluth water supply contained mineral fibres resembling asbestos, which were shown to be an asbestos amphibole, cummingtonite-grunerite. 1989 Jrnl. Petrol. 30 42 The occurrence of cummingtonite instead of garnet in the amphibolite is also consistent with low-pressure hornblende-granulite grade metomorphic conditions. This entry has not yet been fully updated (first published 1997; most recently modified version published online June 2018). < n.1824
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