celsian

[′sel·sē‚an]

(mineralogy)

BaAl₂Si₂O₈ Colorless, monoclinic mineral consisting of barium feldspar.

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

Mentioned in

feldspar

References in periodicals archive

Setlock, "Fabrication of fiber-reinforced celsian matrix composites," Composites Part A: Applied Science and Manufacturing, vol.

Electrochemical Formation of Cerium Oxide/Layered Silicate Nanocomposite Films

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).

First Case Report of a Late Onset Knee Periprosthetic Joint Infection Caused by Lactococcus garvieae

Molly Cliff, a year nine student at Hipperholme and Lightcliffe High School, won a writing prize in a competition organised by Celsian Education.

Molly has the poetic touch

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.

A year to remember for curious students

Richard brings experience from the education recruitment sector, having worked previously for Hays and Celsian Education.

PEOPLE ON THE MOVE

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.

On the move

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.

JOBS: Support service for city teachers

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]).

Zeolite-bearing trachyandesite from Dobranka, Ceske stredohori Mts.: petrography, geochemistry and amygdale mineralogy

SPECIALIST recruitment firm Celsian opens new offices in Liverpool's India Buildings, Water Street, today.

Brief Case

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 ADSL IAD INTEROPERATES WITH VP3000 BROADBAND PLATFORM

Celsian, the barium feldspar, occurs as inconspicuous colorless grains, generally 0.1 mm or smaller in fine-grained quartz.

BARIUM SILICATE MINERALS FROM TRUMBULL PEAK, MARIPOSA COUNTY, CALIFORNIA

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).

The hyalophane occurrence at Zagradski Potok near Busovaca, Bosnia and Hercegovina