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 ?
Blends with primary kaolin (from an in-situ weathered dyke) and felspathic flux separated from granite or the bai-tunze itself by froth flotation produced several excellent bodies that were throwable and translucent.
Mellor (1906) described the cobalt lode in great detail, stating that the country rock is an altered felspathic sandstone or quartzite and that it was altered and partially recrystallized by contact with the extensive basic igneous body overlying it [ILLUSTRATION FOR FIGURE 4 OMITTED].
The bulk of the reserves are in a 30 to 40-m thick series of Orange Felspathic Sands (OFS) at the base of which are two narrow, heavy-mineral-rich, ancient strandlines which run parallel to the coast and 1-3 km from it.