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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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).
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A mineralogical indicator of increasing differentiation of melt is the common enrichment in orthoclase and celsian components towards rims of the crystals ([Or.
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