Gradual fusion; having no sharp melting point. Webster 3rd
Silica glass.
See:argentite
Said of pyroclastic material that is characteristically glassy; i.e.,
contains more than 75% glass. AGI
a. Fused siliceous compounds, such as glasses and enamels, as
distinguished from ceramics, or fused aluminous compounds.
Standard, 2
b. The art or history of glass production. Standard, 2
A tuff that consists predominantly of volcanic glass fragments.
CF:crystal tuff; crystal-vitric tuff. AGI
The manufacture of vitreous or vitrified wares, as glass.
Standard, 2
Of or pertaining to a substance that can be vitrified. Webster 3rd
An act, or instance, or the process of vitrifying or making glassy; the
condition of being vitrified; a vitrified body. Webster 3rd
That resulting directly or indirectly from the permanent physical changes
caused by vitrification.
a. That characteristic of a clay product resulting when the temperature in
a kiln is sufficient to fuse all the grains and close all the pores of the
clay, making the mass impervious. ACSG, 1
b. Converted into glass. Kinney
A very hard paving brick burned to the point of vitrification and
toughened by annealing. Crispin
Having the form or the appearance of glass; glassy. Webster 3rd
To change into glass or into a glassy substance by heat and fusion. To
make vitreous; esp. to produce (as in a ceramic ware) enough glassy phase
or close crystallization by high-temperature firing to make nonporous. To
undergo vitrification or vitrifaction; to become vitreous.
Webster 3rd
A stage in the heating of a clay when some of the ingredients have melted
and have partially or completely closed the pores, as in stoneware and
porcelain. The completion of this stage occurs at the point of maximum
shrinkage without loss of shape. See also:baking; squotting.
Nelson
A coal microlithotype that contains a combination of vitrinite and
inertinite totalling at least 95%, and containing more of each than of
exinite. It generally occurs in high-ranking bituminous coals. AGI
A group name comprising collinite and telinite. Differentiation between
collinite and telinite depends in part on the method of observation. The
distinction is more easily made in thin section or after etching a
polished surface. Often there is uncertainty of distinction by reflected
light, and in such cases, it is proper to use the general term vitrinite.
See also:collinite; telinite. IHCP
The process in coalification that results in the formation of vitrain.
See also:coalification
Vitrain and similar material in coal. AGI
A sulfate of any of various metals (such as copper, iron, or zinc,); esp.
a hydrate (as the heptahydrate) of such a sulfate having a glassy
appearance or luster. Webster 3rd
See:glockerite