A series name to describe potassium-rich dioctahedral micas between or close to the muscovite-aluminoceladonite join and the muscovite-celadonite join (i.e., Al,Mg,Fe-containing).
A series name to describe potassium-rich dioctahedral micas between or close to the muscovite-aluminoceladonite join and the muscovite-celadonite join (i.e., Al,Mg,Fe-containing).
A poorly defined material, possibly a decomposition product of biotite and vermiculite.
See zeolite.
A trioctahedral member of the true mica group. The end-member formula is KMg3AlSi3O10(OH)2. Fe2+ for Mg substitution is common nearly to the Fe end member (annite). Mn and Ti and minor V and Cu substitution is less common. Octahedral vacancies are more prevalent in Fe-containing phlogopite. Phlogopite is defined as having <50% Fe substitution for Mg along the Mg/Fe join. When Fe and Mg content have not been determined, the series name, biotite, is appropriate. Tetrahedral Al substitution tends to be limited to <1.5 cations per formula unit (Fleet, 2003) and Fe3+ and Ti can occupy the tetrahedral site if there is a deficiency in Si. Phlogopite commonly occurs as the 1M and 1Md polytypes, although the 3T and 2M1 forms are less common.
An obsolete and poorly defined term describing material from Fins, France, similar to kaolin but with apparently excess H2O.
A poorly defined material, possibly phlogopite or saponite.
The groundwater table in soil or sediment. The phreatic surface is the interface between the vadose zone (unsaturated water content) and the phreatic zone (saturated with water) of a soil/sediment, usually characterized with a zero porewater pressure.
See peloid.
A family of minerals contain continuous two-dimensional tetrahedral sheets of composition T2O5 (T = Si, Al, Be…) with tetrahedra linked by sharing three corners of each, and with a fourth corner pointing in any direction. The tetrahedral sheets are linked in the unit structure to octahedral sheets, or to groups of coordinated cations, or individual cations. Although continuous tetrahedral sheets often form six-fold rings, other ring configurations are considered part of the phyllosilicate family.
See Guggenheim et al. (2006) and references therein.
Cf., clay mineral