Conditions and mechanism for the formation of iron-rich Montmorillonite …
2011年3月15日 · Nontronite and montmorillonite are dioctahedral smectites with a relatively high layer charge that is generated by tetrahedral substitution in nontronite and by octahedral substitution in montmorillonite. Saponite can be iron- or …
Systematic comparison of the hydration and dehydration of Na+-, …
2023年6月1日 · In this study, the basal spacings of Na +-, K +-, and NH 4 +-montmorillonite (Kp-F), nontronite (H33-a), Al-bearing nontronite (SWa-1), hectorite (SHCa-1), saponite (Sp-Sap), and Fe-saponite (FS009) during hydration and dehydration were systematically measured by using in situ RH-controlled XRD.
Chapter 6 Smectites - ScienceDirect
1978年1月1日 · The mineralogy of montmorillonite and the geology and geochemistry of montmorillonite deposits have been investigated in detail. Montmorillonite deposits of economic importance are distributed only in Tertiary formations, especially in …
USGS OFR01-041: Smectite group
Members of the smectite group include the dioctahedral minerals montmorillonite, beidellite, and nontronite, and the trioctahedral minerals hectorite (Li-rich), saponite (Mg-rich), and sauconite (Zn-rich). The basic structural unit is a layer consisting of two inward-pointing tetrahedral sheets with a central alumina octahedral sheet.
Synthesis of nontronite and other Fe-rich smectites: a critical …
2017年12月1日 · The most common smectite end-members are montmorillonite [4 (Si 4) 6 (Al 2−y Mg-R 2+ y)O 10 (OH) 2 M + y], beidellite [4 (Si 4–x Al x) 6 (Al-R 3+) 2 O 10 (OH) 2 M + x], nontronite [4 (Si 4–x (Al-Fe 3+) x 6 ((Fe 3+-Al) 2–y (Fe 2+-Mg) y))O 10 (OH) 2 M + x+y], and saponite [4 (Si 4–x Al x) 6 (Mg-Fe 2+) 3 O 10 (OH) 2 M + x+y], where M ...
Soil Smectite - University of Wisconsin–Madison
Specific minerals included in the smectite family are montmorillonite, beidellite, saponite, nontronite, and several less common species. Smectites are constructed of a single octahedral sheet sandwiched between two tetrahedral sheets, with the octahedral sheet sharing the apical oxygens of the tetrahedral sheet.
The Electron-Optical Investigation of Clays - GeoScienceWorld
The smectites (or montmorillonite–saponite group) are defined as layer-lattice minerals with a 2:1 (triphormic) structure that undergo interlayer swelling when exposed to water or water-vapour, or any one of several organic liquids; this swelling can be detected by alteration of the 001 spacing measured by X-ray diffraction.
smectite/montmorillonite有什么区别？ - 知乎
smectite是大类，montmorillonite是其中一类 smectite来源于smectos，类似soap的意思 下有montmorillonite, hectorite, beidellite, saponite, nontronite, sauconite几类
Smectite - Wikipedia
In clay mineralogy, smectite is synonym of montmorillonite (also the name of a pure clay mineral phase) to indicate a class of swelling clays. The term smectite is commonly used in Europe and in the UK while the term montmorillonite is preferred in North America, but both terms are equivalent and can be used interchangeably.
Smectite Ceramics - 911Metallurgist
2017年11月28日 · Typical analyses of sodium montmorillonite, calcium montmorillonite, saponite, nontronite, and hectorite are shown in Table 1. The smectite minerals are very fine in particle size usually of the order of less than one micron. Most smectites are dry processed for use as drilling muds, foundry bond clays, ore pelletizing, and sealants.
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