| 单词 |
montmorillonoid |
| 释义 |
montmorillonoid Min.|mɒntmɒˈrɪlənɔɪd|
[f. as prec. + -oid.]
Any of a group of clay minerals that comprises montmorillonite together with some chemically related minerals that likewise undergo a reversible expansion on absorbing water and have a characteristic structure in which water molecules are situated between sheets composed of two layers of silicon atoms sandwiching one nominally of aluminium, the differences between the minerals consisting in the extent and nature of the replacement of silicon and aluminium by other elements. Also attrib. or as adj.
1951Clay Minerals Bull. I. 195 To avoid this confusion and also the lengthy term ‘minerals of the montmorillonoid group’..the term ‘montmorillonoid’ was suggested [by D. M. C. MacEwan] for this group of minerals. 1951D. M. C. MacEwan in G. W. Brindley X-Ray Identification & Crystal Struct. Clay Minerals iv. 86 (heading) The montmorillonite minerals (montmorillonoids). 1953Jrnl. Soil Sci. IV. 233 It is fairly simple to detect by X-ray diffraction the presence of montmorillonoids in clays using glycerol..or ethylene glycol. 1955Trans. Faraday Soc. LI. 582 Considerable attention has been paid in recent years to the retention of organic molecules by clays of the montmorillonoid group. 1959Clay Minerals Bull. IV. 67 The name montmorillonoid is understood as covering a continuous isomorphous series extending from montmorillonite, with ideal formula Al2Si4O10(OH)2, to beidellite, with ideal formula (R1H3O)Al2(Si3Al)O10(OH)2. 1966Canad. Jrnl. Soil Sci. XLVI. 235 Montmorillonoid minerals are sometimes more abundant in the lower horizons of soils in which other clay minerals are more uniformly distributed. 1971Clay Minerals IX. 107 Results of..analyses confirm the general montmorillonoid character of the mineral. |
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