See binuclear complex.

A species of the chlorite mineral group with trioctahedral sheets only. This is the common form of chlorite.
Cf., dioctahedral chlorite, di,trioctahedral chlorite, trioctahedral sheet

A poorly defined material, possibly interstratified biotite and vermiculite.

In the ideal case, the smallest structural unit contains three octahedra. If two such sites are occupied with cations and one site is vacant, then the octahedral sheet is considered “dioctahedral”. If all three sites are occupied, the sheet is considered “trioctahedral”. (Quot Guggenheim et al., 2006; see also references therein). A trioctahedral sheet generally contains predominantly divalent cations.
Cf., dioctahedral sheet

See Stern layer.

An invalid term, previously used as a classification of the micas where the number of silicon atoms per formula unit is three per four tetrahedral sites.
See Rieder et al. (1998).
Cf., mica, true mica, brittle mica, interlayer-deficient mica, group names.

A group name for platy phyllosilicates of 2:1 layer and a layer charge of ~ -1.0 per formula unit. True micas do not show swelling capacity. Rieder et al. (1998) defines the true micas as having greater than 50% of the interlayer cations as univalent cations. The true mica group is further divided into subgroups based on the octahedral sheet being either trioctahedral or dioctahedral.
Cf., mica, brittle mica, interlayer-deficient mica, group names

See reyerite group.

See Transition State Theory.

A member of the palygorskite-sepiolite group with a composition of approximately Na_1.87Fe_2.14Mn_0.48Ti_0.14 (Si₈O₂₀) (OH)₂^.n(H₂O).
See palygorskite-sepiolite group