nosean


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nosean

(ˈnəʊzɪən)
n
(Geological Science) mineralogy a mineral with formula Na8Al6Si6O24(SO4), found in igneous rock as isometric crystals
[named after the German mineralogist K. W. Nose (1753–1835), who discovered it]
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References in periodicals archive ?
Birmingham (1988) reported tiny purple crystals enclosed in sodalite and nosean in the Tertiary intrusives.
Species range from the very common (apophyllite, barite, calcite, corundum) to the semi-exotic (baddeleyite, hauynite, nosean, ettringite, jeremejevite) to the extremely rare (hannebachite, willhendersonite, the not-yet-published batiferrite), and all in selections liberal enough to show a full range of habits--I counted 25 pictures, each one different, of barytolamprophyllite alone.
Occurrence: In a thin aegirine-potassic-feldspar pegmatite crosscutting nepheline and nosean syenites.
The sodalite family is composed of the minerals sodalite, nosean, hauyne and lazurite; cubic aluminosilicate species with the formula [(Na,Ca).sub.4-8] [Al.sub.6][Si.sub.6][O.sub.24][([SO.sub.4],Cl,OH,S).sub.1-2] n[H.sub.2]O.
Three of the four members of the sodalite group - sodalite, hauyne and lazurite - are known to occur at Monte Somma/Vesuvius, while unconfirmed tests suggest that the fourth member, nosean, is also present.
Typical associated minerals include a sodalite-group mineral (sodalite, lazurite, hauyne or nosean), nepheline, diopside, sanidine, pargasite, phlogopite-biotite and calcite.