An obsolete term for a chlorite material, rich in ferric iron, probably a Mg-rich chamosite.

An approximate method of incorporating quantum mechanics in calculating the electronic structure and related properties of a finite or periodic molecular model. This method differs from ab initio methods (i.e., a first principles method typically using a molecular orbital model) in that electron-electron interactions are approximated using functional mathematics in vector space.
Cf., molecular dynamics, quantum calculation

In geology, sedimentary deposits (or eluvium) derived by weathering, either with or without significant movement by the effects of gravity. In soil science, a soil horizon developed by the removal of soil material in suspension or solution (leaching) from a layer of a soil.

See hydrotalcite group.

The deviator stress is the difference between the major principal stress (σ₁) and minor principal stress (σ₃). The deviator stress usually defines the shear resistance of a clayey soil under triaxial shear loading.

See astrophyllite group.

Crystallization from a glass.

An obsolete term for a mixture of poorly crystalline phyllosilicates (1:1 and 2:1 types). When red, “deweylite” was called “eisengymnite”, and when found at Bare Hills, Maryland, USA, “deweylite” was called “gymnite”.

See density functional theory.

A species of the chlorite mineral group with a dioctahedral 2:1 layer and a trioctahedral interlayer (e.g., cookeite, sudoite).
Cf., trioctahedral chlorite, dioctahedral chlorite, dioctahedral sheet, trioctahedral sheet