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 ?
The onyx and amazonite glistened like drops of black and turquoise paint.
Further geologic work to correlate scandium and REE presence within various host minerals in the pegmatites, specifically micas, feldspars, quartz, gadolinites and amazonites, and
Colorado amazonite specimens frequently receive this same treatment, to intensify their color a bit.
Roter, Tom Hughes), self-collected Colorado specimens (Tim Hillston), self-collected Pikes Peak minerals (Ray and Eloise Berry), Pikes Peak amazonite and smoky quartz specimens self-collected between 1999 and 2005 (Joe, Scott and Tim Dorris), and notable Colorado species found elsewhere in the world (American Museum of Natural History).
The amazonite crystals occur within clay-filled miarolitic cavities in pegmatites in the Pikes Peak Granite.
He found and dug with hand tools a fabulous pocket of amazonite and quartz crystals.
Beautiful blue-green Colorado amazonite has long been a favorite among collectors; fine specimens were first collected there by one of the first American mineral dealers, A.
1979) Amazonite from the Pikes Peak Batholith, Colorado.
I did not see any of the amazonite in situ in the wall.
The "chrysoprase" may well have been amazonite microcline from the same deposit.
In Colorado he mined amazonite with Clarence Coil and his son every year from 1970 through 1986.
Some microcline of the amazonite variety has been said to occur at Erongo, but the specimens most likely came from the nearby Klein Spitzkoppe, where microcline is locally abundant (Cairncross, 2004).