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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. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Puis, aux stades inter mediaires, la formation de plagioclases reduit considerablement la teneur en Sr et, aux stades finaux, la formation de feldspaths alcalins en extrait le Ba et le Rb alors que se forment les trachytes et les phonolites a partir de magmas alcalins. The feldspath ceramics for chairside restorations (CEREC) will be available to customers as CEREC blocks. One of the drill hole located under the main deposit, 395 metres deep, intersected a porphyric sill containing quartz phenocrystals and feldspath and returned grades of 8. |
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