Celsian


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celsian

[′sel·sē‚an]
(mineralogy)
BaAl2Si2O8 Colorless, monoclinic mineral consisting of barium feldspar.

Celsian

 

a mineral; a barium feldspar, with the composition Ba[Al2Si2O8]. The mineral is named in honor of the Swedish scientist A. Celsius. Celsian contains admixtures of K, Ca, and Sr. It crystallizes in the monoclinic system. Its structure, ordering, and conditions of formation are the same as those of other potassium-sodium feldspars. Celsian, which is colorless, has a density of 3,300–3,400 kg/m3 and a hardness of 6–6.5 on Mohs’ scale. A rare mineral, it is usually found in contact metasomatic deposits enriched by manganese rocks. In the USSR it is found in the Ukraine. There are also deposits in Sweden, Japan, and other countries.

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Setlock, "Fabrication of fiber-reinforced celsian matrix composites," Composites Part A: Applied Science and Manufacturing, vol.
On clinical examination we suspected a local infection due to the presence of the Celsian clinical features for acute inflammation, represented by pain, swelling, local heat, erythema, and movement disorder with partial loss of function (functio laesa).
Molly Cliff, a year nine student at Hipperholme and Lightcliffe High School, won a writing prize in a competition organised by Celsian Education.
The ninth Senior Citizens' Christmas Party was attended by more than 170 guests and supported by a range of local organisations, including Alcoa, BJ Bingo, Max Spielmann Celsian Education, Midland's Ambassador Century Woodall certificate.
Richard brings experience from the education recruitment sector, having worked previously for Hays and Celsian Education.
Celsian Education is one of the largest supply teacher agencies in the North East, providing over 300 supply teachers to North East schools every week.
SPECIALIST education recruiter Celsian, which has an office in Coventry, has designed a unique programme to support newly qualified teachers (NQTs) during their first year of supply teaching.
A mineralogical indicator of increasing differentiation of melt is the common enrichment in orthoclase and celsian components towards rims of the crystals ([Or.sub.4.5] - [Or.sub.7.6], [Cn.sub.0.3-1.2]).
SPECIALIST recruitment firm Celsian opens new offices in Liverpool's India Buildings, Water Street, today.
Celsian Technologies Inc., Tustin, Calif., a manufacturer of broadband voice and data products, and MetaSwitch have announced that the Celsian Momentum V Series ADSL 4 port Voice Over DSL router has successfully passed interoperability testing with MetaSwitch's VP3000 Broadband Voice Platform.
Celsian, the barium feldspar, occurs as inconspicuous colorless grains, generally 0.1 mm or smaller in fine-grained quartz.
Hyalophane, (K,Ba)Al(Si,Al)[Si.sub.2][O.sub.8], is the barium analog of orthoclase and intermediate between orthoclase and celsian. Its name was derived from the Greek words hialos = glass and phainethai = to appear (Strubel and Zimmer, 1991).