feldspar

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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 ?
Formula #1 Potash felspar 48 Spodumene 05 Whiting 14 Kaolin 14 Silica 19 100 Copper carbonate 02 CMC added Formula #2 Custer felspar 177.
She has relationships with mines and knows how the light reflection in the felspar is different from one mine to the next.
Felspar is alkaline alumino silicate with varied compositions and similar crystalline structure.
Lee Rexrode, ceramics professor at Edinboro University of Pennsylvania, combines cobalt oxide with felspar that is melted in a crucible.
Today a basic recipe is made of the following: 50 percent bone ash, 25 percent kaolin and 25 percent felspar.
Traditionally, porcelain clay body formulas are composed of 50 percent of a single kaolin, 25 percent flint and 25 percent felspar and do not handle well, resulting in a 'flaccid' condition and 'rubbery' feel in forming operations.
This classification method allows for a substitution of one felspar with another within the same group.
In this way the recipe of 'Shinophiles' is to be found in the felspar but what about the shapes?
BASIC DRY GLAZE Potassium felspar 14 Whiting 24 China clay 57 Bentonite 5
I stuck to the simpler ingredients of felspar, clay, silica and calcium.
Turquoise (Greg Daly's E32) (03) Frit 4110 90 Potash felspar 4 Calcite 2 Silica 3 China clay 1 Copper oxide 2 3.