feldspar

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Related to felspars: Potassium feldspar, felspar, alkali feldspars

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 ?
The bag of felspar a potter uses in the studio takes considerably more effort to produce than just digging the ore from the ground.
It is in this context of increasing costs of production that G-200 felspar is no longer available; potters are now faced with finding a suitable substitute for their clay body and glaze formulas.
Once the existing stocks of G-200 felspar are depleted MC 200-K can be used as a viable substitute.
Comparison Glazes Clear Transparent Glossy Cone 10 Oxidation Gas Kiln Firing Custer Felspar 42 G-200 Felspar 42 MC 200-K Felspar 42 Ferro frit #3195 35 Ferro frit #3195 35 Ferro frit #3195 35 Flint 325x 13 Flint 325x 13 Flint 325x 13 EPK 6 EPK 6 EPK 6 Whiting 4 Whiting 4 Whiting 4
The following glaze formulas used MC 200-K and Custer as a one-to-one replacement for G-200 felspar.
Comparison Glazes Clear Transparent Glossy Cone 6 Oxidation Electric Kiln Firing Custer Felspar 21 G-200 Felspar 21 MC 200-K Felspar 21 Ferro frit #3195 50 Ferro frit #3195 50 Ferro frit #3195 50 Flint 325x 16 Flint 325x 16 Flint 325x 16 EPK 8 EPK 8 EPK 8 Whiting 5 Whiting 5 Whiting 5
Clay body formulas #3 and #4 produced the whitest fired colour using combinations of Helmer kaolin and MC 200-K felspar.
1 #2 EPK 50 EPK 50 MC 200-K felspar 25 Custer felspar 25 Flint 200x 25 Flint 200x 25
Potters are now faced with either using Custer felspar in place of or finding a new potassium based felspar.
Information on felspar location and mining procedures supplied by i-minerals, inc.
Chemical analysis of G-200 and Custer felspar supplied by Digital Fire Reference Data Base.