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Montmorillonite general formula

The clay used is a montmorillonite referenced KC2 provided from CECA (France). Its general formula is (Si8 O2o AI4.X Mx)(OH)24 CEy. n H20, where CE are exchangeable cations. [Pg.310]

The smectite group of clay minerals is also poorly crystalline but perhaps better known because of their cation exchange capacity and their occurrence in the bentonite clays. A general formula for montmorillonite, which is one of the dioctahedral smectites is... [Pg.63]

Montmorillonite. A group of expanding-lattice clay minerals of the general formula Mo.33Al2Si40io(OH)2nH20 where M includes one or more of the cations Na+, Mg-+, K+, Ca-+, and possibly others. [Pg.654]

Among the smectites, montmorillonite and beidellite form a series with the general formula... [Pg.316]

Smectites, which are based on either the trioctahedral 2 1 (talc) or dioctahedral 2 1 (pyrophyllite) structure, differ from these neutral structures by the presence of isomorphous substitution in the octahedral or tetrahedral sheet. For example, the dioctahedral smectite, montmorillonite, has the general formula... [Pg.46]

Studies have been performed on the montmorillonites with the objective of learning about the mechanism of their catalysis and their potential role in the prebiotic syndiesis of RNA. Montmorillonites are 2 1 layer silicates having the following general formula ... [Pg.302]

Commercial synthetic catalysts are amorphous and contain more silica than is called for by the preceding formulas they are generally composed of 10 to 15% alumina (AI2O3) and 85 to 90% silica (Si02). The natural materials—montmorillonite, a nonswelling bentonite, and halloysite—are hydrosilicates of aluminum, with a... [Pg.83]

Clay minerals are formed when igneous rocks weather. These minerals are the main constituent of fine-grained (<63 rm) particles in mud. In general these minerals are less cation-rich than their igneous precursors. Kaolinite has the simplest clay mineral formula because it is pure aluminosilicate. It is the mineral that held the secret to making porcelain, which was greatly valued by the emperors of China before AD 1000, after they discovered how hard and clear kaolin becomes when heated to 1300-1400 °C. Other, more complicated clay minerals, e.g. iUite and montmorillonite, have various amounts of cations added to their structures. [Pg.59]

The 2 1 layer type has two tetrahedral sheets sandwiching an octahedral sheet. The three clay groups with this structure are (illitic) mica, vermicu-lite, and smectite (montmorillonite), each with the general unit cell chemical formula ... [Pg.6]

These minerals are hydrated aluminosilicates which are characterized by a sheetlike structure and can be conveniently divided into three groups (1) the kaolinite group, (2) the mont-morillonite group, and (3) the potash clay (or hydrous mica) group (Table 7.7). In the kaolinite group, all have the same chemical composition and differ only in individual crystal structures. The montmorillonite group can be represented by means of ion substitutions in the general chemical formula. For example, in montmorillonite itself, approximately 16% of the aluminum... [Pg.198]

Most common clay mineral of this group is montmorillonite, the general chemical formula of which is given below ... [Pg.42]

See other pages where Montmorillonite general formula is mentioned: [Pg.27]    [Pg.501]    [Pg.180]    [Pg.264]    [Pg.473]    [Pg.197]    [Pg.3]    [Pg.214]    [Pg.3]    [Pg.264]    [Pg.566]    [Pg.81]    [Pg.137]    [Pg.25]    [Pg.87]    [Pg.2]    [Pg.92]    [Pg.351]    [Pg.16]    [Pg.46]    [Pg.20]    [Pg.166]    [Pg.565]    [Pg.567]    [Pg.4]    [Pg.504]    [Pg.42]    [Pg.108]    [Pg.258]    [Pg.595]   
See also in sourсe #XX -- [ Pg.25 ]



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