Obsolete term for less hydrated form of halloysite, now halloysite (7 Å).

See tobermorite.

Kaolin material that has been heat-treated to partial or complete dehydroxylation.
Cf., dehydroxylate, dehydroxylation, thermally activated clay

An obsolete term for muscovite.

A poorly defined material, possibly interstratified phlogopite and vermiculite.

A general term for platy phyllosilicates of 2:1 layer and a layer charge of ~ -1.0 per formula unit (true mica group) or ~ -2.0 per formula unit (brittle mica group) or between -0.6 to -0.85 per formula unit (interlayer-cation-deficient mica group, abbreviated to interlayer-deficient micas). Micas do not show swelling capability. Octahedral character, either trioctahedral or dioctahedral, further divides the mica groups into subgroups, whereas chemical composition separates the species within the subgroups.
Cf., true mica, brittle mica, interlayer-deficient mica, group names

A mineral habit where individual grains are platy in shape, as often caused by a single plane of cleavage.
Cf., habit

An aggregate of surfactant molecules (each molecule consisting of a non-polar hydrophobic tail and polar hydrophilic head) dispersed as a liquid colloid. In aqueous solutions, a micelle forms with the tails oriented inward and the heads facing outward to solution.

The Michaelis-Menten kinetics equation describes the kinetics of many enzyme-catalyzed reactions and involves an enzyme binding to a substrate to form a complex. This complex produces a product and additional enzymes, which produces more complexes with a consequential increase in the reaction rate. The equation has been successful in describing the rates of many biochemical reactions (e.g., protein-protein reactions) other than in complexes involving enzyme binding substrates.

See alkali feldspar.