| 单词 |
rectorite |
| 释义 |
rectorite Min.|ˈrɛktəraɪt|
[See quot. 1891 and -ite1.]
An aluminosilicate of sodium that is a clay mineral of the montmorillonite group and occurs as large, soft white leaves or plates.
1891Brackett & Williams in Amer. Jrnl. Sci. CXLII. 16 The second hydrous silicate of alumina..is found in the Blue Mountain mining district in Marble Township, Garland county [Arkansas]... We propose the name Rectorite for this,..in honor of Hon. E. W. Rector, of Hot Springs, Ark., who originated and has so unceasingly supported..the bills providing for the Geological Survey of Arkansas. 1950Amer. Mineralogist XXXV. 590 The structural scheme of rectorite consists of contiguous pairs of pyrophyllite-like units separated by pairs of layers of water molecules. An equally apt description would be the alternation of one pyrophyllite unit with one vermiculite unit. 1970Clays & Clay Minerals XVIII. 239 Pyrophyllite is widespread in pelitic rocks of the Manning Canyon Shale in north central Utah, and the association of this mineral with other clay minerals, especially rectorite, is related to the origin. The regular mixed-layer clay mineral rectorite seems to form as a result of the alteration of muscovite—paragonite during late stages of diagenesis... Pyrophyllite subsequently formed from the alteration of rectorite during advancing metamorphism. |
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单词 rectorial 释义 rectorial, a. and n.|rktrl|[f. rector + -ial.]A. adj.1. Of or pertaini......