Hector clay

Hector clay Hectabrite AW Hectabrite DP Ghassoulite Laponite SHCa-1 Strese Hofmann s Hectorite. 

CAS 12173-47-6 EINECS/ELINCS 235-340-0 Synonyms Hector clay Hectorite clay... 

Hectabrite AW, Hectabrite DP, Hectallte 200 S Hectallte GM Hector clay. See Hectorite Hectorite... 

Hectorite. Originally known as hector CLAY from its source near Hector, California, USA. It is a hydrous magnesium silicate related to montmorillonite and forming an end-member of the saponite series. 

Type material from Hector clay pit, San Bernardino County, California. 

Heavy normal paraffins concentrate (petroleum) Heavy normal paraffins (petroleum). See Paraffins, normal C5-20 Heavy spar. See Barium sulfate HEC HE cellulose. See Hydroxyethylcellulose Hector clay. See Hectorite Hectorite... 

The material from the Hector area of California is believed to have formed by the action of hot spring waters containing Li and F on clinoptiolite. The Mg was obtained from the alkaline lake waters (Ames and Goldich, 1958). The material from Morocco is associated with marls and is believed to be authigenic. These two types of trioctahedral smectite appear to be the only ones with a relatively pure Si tetrahedral sheet. No analyses were found which indicated tetrahedral Al values between 0.02 and 0.30. Analyses of saponite indicate there is complete isomorphous substitution between the range Si3.70 Al0.3o and Si3.0s Al0.92 (Table XXXIX). Caillere and Henin (1951) reported an analysis of a fibrous expanded clay (diabantite) which had a tetrahedral composition of Si3.i7 Alo.49 Fe3+0.34. There is some question as to whether this should be classified as a smectite regardless, it indicates the possibility of Fe3+ substitution in the tetrahedral sheets of the trioctahedral 2 1 clays. 

Two experimental methods have been described recently which should help the analysis of phospholipids. Details of a high-performance liquid chromatographic method for the rapid separation of phospholipids have been published, and hector-ite clay matrices have been used to stabilize phospholipid bilayers so that their vibrational spectra can be measured. The bilayers are incorporated into the clay to form ultra-thin, self-supporting films about 25 wm thick, and although some regions of the spectrum are masked by vibrations due to the clay, vibrations due to both the phosphoryl head-group and the acyl chain can be observed. 

Materials. Naturally occurring sodium hectorite from Hector, California, with a particle < 2 Xm was obtained from the source clay mineral repository. University of Missouri, Columbia. The cation exchange capacity, as determined by the displacement of ammonia from an ammonium saturated sample using NaOH and an ammonia specific electrode, was 73 meq per 100 grams of air-dried clay. All reagents and solvents used in this work were obtained from Chemical Dynamics Corporation and Aldrich Chemical Company and were used without further purification. 

Ostrom, M. E., 1960. An interlayer mixture of 3 clay mineral types from Hector, California. Am. Mineralogist 45 886. 

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