Definition of devitrification
i. Deferred crystallization, which, in glassy igneous rocks, converts obsidians and pitchstones into dull cryptocrystalline rocks (commonly called felsites) consisting of minute grains of quartz and feldspar. Such devitrified glasses reveal their originally vitreous nature by traces of perlitic and spherulitic textures.
ii. The process by which glassy rocks break down into definite minerals, which are commonly minute, chiefly quartz and feldspar.
iii. Any change from a glassy state to a crystalline state after solidification.
iv. In ceramics, a surface defect manifested by loss of gloss as a result of crystallization.
ii. The process by which glassy rocks break down into definite minerals, which are commonly minute, chiefly quartz and feldspar.
iii. Any change from a glassy state to a crystalline state after solidification.
iv. In ceramics, a surface defect manifested by loss of gloss as a result of crystallization.