smectiten.

/ˈsmɛktʌɪt/

Etymology: See smectis n. and -ite suffix¹ 2b.

Mineralogy.

a. A kind of fuller's earth. Now Obsolete exc. Historical.

ΘΚΠ

the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > smectites > fuller's earth > varieties

smectis1706

penny-earth1712

smectite1811

1811 J. Pinkerton Petralogy I. 278 [Iconite contains] a combination which nearly corresponds with the smectite of Cimolus.

1868 H. Watts Dict. Chem. Smectite, a term..applied..more particularly to an argillaceous mineral from Cilly in Lower Styria,..and another from Condé in France.

1932 Amer. Mineralogist 17 198 It seems hardly worth while to retain the two names smectite and montmorillonite for what appears to be the same mineral... It seems in the best interests of science to continue the name montmorillonite, and to drop that of smectite.

1942 Amer. Mineralogist 27 810 The differential thermal curve for the smectite sample..is like that of montmorillonite... This is in agreement with Kerr's..conclusion [prec. quot.] that smectite is not a valid species because of its similarity to montmorillonite.

b. = montmorillonoid n. So smectite group = montmorillonite group n. at montmorillonite n. Compounds.

ΘΚΠ

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

montmorillonite group1938

montmorillonoid1951

smectite1955

1955 G. Brown in Clay Minerals Bull. II. 296 Smectites is the name proposed for the minerals at present variously known as montmorillonoids, montmorins, minerals of the montmorillonite group and frequently even montmorillonites. Smectites are defined as minerals composed of 2:1 or triphormic layers, which, when the readily exchangeable cations are replaced by Na⁺ and the material is saturated with glycerol, give a basal spacing of 18Å approximately.

1957 R. Greene-Kelly in R. C. Mackenzie Differential Thermal Investigation of Clays v. 140 By far the most abundant dioctahedral smectite is montmorillonite.

1966 W. A. Deer et al. Introd. Rock-forming Minerals iii. 264 An alternative term once used for this type of clay [sc. montmorillonoids] is ‘smectite’, and this has now been revived to describe the group as a whole.., which contains the following principal members: montmorillonite, beidellite, nontronite, saponite, hectorite and sauconite.

1975 Amer. Mineralogist 60 66/1 The significant chemical and physical properties of smectites often depend on the nature of the interlayer exchange ions.

1979 Sci. Amer. Apr. 78/1 (caption) Smectite group of clay minerals, formerly called the montmorillonite group, has extremely fine-grained, irregular and thin-layered crystals.

This entry has not yet been fully updated (first published 1912; most recently modified version published online June 2018).

单词	smectite
释义	smectiten. /ˈsmɛktʌɪt/ Etymology: See smectis n. and -ite suffix¹ 2b. Mineralogy. a. A kind of fuller's earth. Now Obsolete exc. Historical. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > smectites > fuller's earth > varieties smectis1706 penny-earth1712 smectite1811 1811 J. Pinkerton Petralogy I. 278 [Iconite contains] a combination which nearly corresponds with the smectite of Cimolus. 1868 H. Watts Dict. Chem. Smectite, a term..applied..more particularly to an argillaceous mineral from Cilly in Lower Styria,..and another from Condé in France. 1932 Amer. Mineralogist 17 198 It seems hardly worth while to retain the two names smectite and montmorillonite for what appears to be the same mineral... It seems in the best interests of science to continue the name montmorillonite, and to drop that of smectite. 1942 Amer. Mineralogist 27 810 The differential thermal curve for the smectite sample..is like that of montmorillonite... This is in agreement with Kerr's..conclusion [prec. quot.] that smectite is not a valid species because of its similarity to montmorillonite. b. = montmorillonoid n. So smectite group = montmorillonite group n. at montmorillonite n. Compounds. ΘΚΠ the world > the earth > minerals > types of mineral > silicates > phyllosilicate > [noun] > smectites montmorillonite group1938 montmorillonoid1951 smectite1955 1955 G. Brown in Clay Minerals Bull. II. 296 Smectites is the name proposed for the minerals at present variously known as montmorillonoids, montmorins, minerals of the montmorillonite group and frequently even montmorillonites. Smectites are defined as minerals composed of 2:1 or triphormic layers, which, when the readily exchangeable cations are replaced by Na⁺ and the material is saturated with glycerol, give a basal spacing of 18Å approximately. 1957 R. Greene-Kelly in R. C. Mackenzie Differential Thermal Investigation of Clays v. 140 By far the most abundant dioctahedral smectite is montmorillonite. 1966 W. A. Deer et al. Introd. Rock-forming Minerals iii. 264 An alternative term once used for this type of clay [sc. montmorillonoids] is ‘smectite’, and this has now been revived to describe the group as a whole.., which contains the following principal members: montmorillonite, beidellite, nontronite, saponite, hectorite and sauconite. 1975 Amer. Mineralogist 60 66/1 The significant chemical and physical properties of smectites often depend on the nature of the interlayer exchange ions. 1979 Sci. Amer. Apr. 78/1 (caption) Smectite group of clay minerals, formerly called the montmorillonite group, has extremely fine-grained, irregular and thin-layered crystals. This entry has not yet been fully updated (first published 1912; most recently modified version published online June 2018). < n.1811
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