A glaze is a vitreous, watertight coating often used to seal porous ceramics, such as earthenware. Glazes are commonly made from clay mixed with a flux to lower the melting temperature, then applied to the green body and fired. Colorants, commonly iron, copper, or cobalt compounds, may be added, especially to color vases or tiles.
Cf., ceramic, earthenware, green body, tile

Symmetry involving reflection across a plane coupled with a translation of a/2, b/2 or c/2 parallel to an axis (a-glide, b-glide, or c-glide, respectively) or between two axes (n-glide with translations of a/2 + b/2, b/2 + c/2, or a/2 + c/2; d-glide or diamond glide with translations of a/4 + b/4, b/4 + c/4, or a/4 + c/4) or between three axes for tetragonal or isometric crystals with a translation component of a/4 + b/4 + c/4.

An obsolete term for illite.

See diaspore.

A poorly known, modulated 2:1 layer silicate (Guggenheim and Eggleton, 1987). Although superficially resembling chlorite, gonyerite has a two-layer structure with structurally different types of interstratified layers. Inverted tetrahedra occur between the 2:1 layer and linked to the what would be the brucite-like interlayer in an ideal chlorite. Samples of gonyerite are generally impure, although an analysis by Frondel (1955) reported an approximate composition of (Mn_3.25Mg_1.95Fe³⁺_0.64)(Si_3.75Fe³⁺_0.17Al_0.08)O_10.2(OH)_7.8 and is based on the assumption that gonyerite is a chlorite and all iron is ferric. Gonyerite occurs in low-grade metamorphic, silicate-rich manganese deposits, such as that at the Harstigen Mine, Pajsberg, Värmland, Sweden.

An obsolete term for nontronite.

A Monte Carlo molecular simulation that is based on the grand canonical thermodynamic ensemble, an ensemble (e.g., a system of particles) in statistical mechanics that describes the possible states of the particles in equilibrium. The model system properties of chemical potential, volume, and temperature are held constant, but the number of particles in the system (e.g., interlayer water molecules) is allowed to vary as equilibrium is achieved. In this context, equilibrium implies both potential energy and system density (number of particles). Monte Carlo moves are accepted based on the energy change of the move according to a Boltzmann probability (so that some moves resulting in higher energy are accepted).
Cf., force field, molecular dynamics, Monte Carlo molecular simulation

See garnet.

See b-fabric.

A green body is an unfired clay-based object, e.g., made from mixtures of milled clay, quartz, feldspar, and appropriate amounts of water, and formed by molding, pressing, or by a potter’s wheel. The green body is fired in kilns to obtain a ceramic object.
Syn., greenware;
Cf., ceramic, pottery