feldspar

(redirected from microcline)
Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to microcline: sanidine, orthoclase

feldspar

[feld′spär]
Etymology: Ger, feld, field, spath, spar
a crystalline mineral of aluminum silicate with potassium, sodium, barium, and calcium. It melts over a range of 593.5° C to 1093° C (1100° F to 2000° F) and is an important component of dental porcelain.

feldspar (feld´spär),

n a crystalline mineral of aluminum silicate with po-tassium, sodium, barium, or calcium– NaAlSi3O8 or KAlSi3O8. Feldspar melts over a range of 1,100°F to 2,000°F (593.5°C to 1093.5°C). An important constituent of dental porcelain.
feldspar, orthoclase ceramic,
n a clay found in large quantity in the solid crust of the earth. It acts as a filler and imparts body to the fused dental porcelain.
References in periodicals archive ?
Because microcline is the thermodynamically stable state for K-feldspar under ambient conditions, one might expect re-equilibration to a highly ordered structure to be the norm for ancient igneous complexes.
Martin, McGill University, for providing the reference microcline sample used to confirm the accuracy of our experimental procedure.
Les principaux mineraux presents sont le quartz, le feldspath plagioclase (albite-oligoclase) et la microcline perthitique.
Deep drillings revealed a zone of microcline granites and granite migmatites intruding metamorphic rocks of the granulite or amphibolite facies.
It is light-grey, coarse-grained, biotite-muscovite granite containing approximately 20% microcline phenocrysts, and is from the youngest part of the Intrusive Suite (Stewart et al.
Other soils contain significant amounts of K-bearing feldspars derived from granitic rocks of the region; XRD patterns indicate that microcline and/or orthoclase are present in all the soils except for a few sandy soils.
Hydrothermal minerals are calcite, chlorite, albite, microcline, epidote, opaline silica, titanite and rutile-anatase, and some sericite and clay minerals.
Microcline accounts for only some per cent of feldspars, which is a little more preserved in the albic horizon and has disappeared from the spodic horizon.
The rest (20%) are grey, dotted, crystallitic b-fabric (calcareous) 2E Quartz (fresh) and few Absent plagioclases and microclines (dotted), equant, subangular, with a bimodal distribution: 80% fine subangular sand, 20% coarse subrounded sand, random distribution 2Eg i.