Inappropriate usage for a tetrahedral sheet.
See tetrahedral sheet

A tetrahedral sheet contains continuous two-dimensional corner-sharing coordination tetrahedra involving three corners and the fourth corner pointing in any direction. The tetrahedral sheet generally has a composition of T₂O₅ (T = Si, Al, Fe³⁺, Be, B…). After Guggenheim et al. (2006); see also references therein.
Cf., octahedral sheet

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

The recording of the change in temperature and/or mass of a material when heated.

Rate of heat flow through a material. Heat flow is given as a unit of cross sectional area, per unit of temperature and time along the direction of heat flow.

See diffusion.
Cf., thermal conductivity.

The change in volume of a material with increase in temperature. It is often expressed as the coefficient of thermal expansion, which is the degree of expansion divided by the change in temperature.

A clay treated by heating (to dehydroxylation temperatures) to increase reactivity (e.g., as a preparation step to form geopolymers). During thermal activation, the clay minerals (partly) dehydroxylate resulting in distorted structures with broken bonds, which increases reactivity.
Syn., metaclay.
Cf., activated clay, firing

The study of energy (potential, kinetic and internal energy) and its conversion to heat (involving work, determining forces, energy transfer, etc.) to characterize systems. Chemical thermodynamics considers energy changes that occur from reactants to reaction products or with physical changes of state during a chemical reaction. Thermodynamics considers macroscopic qualities (temperature, pressure, volume, composition, etc.) and does not provide mechanistic (atomic theory, atomic structure, molecules, etc.) understanding.

An obsolete term for a poorly defined serpentine phase, from Hoponsuo, Finland.