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Nosean, also known as Noselite, is a mineral of the feldspathoid group with formula:Na8Al6Si6O24(SO4). It forms isometric crystals of variable color: white, grey, blue, green, to brown. It has a Mohs hardness of 5.5 to 6 and a specific gravity of 2.3 to 2.4. It is fluorescent. It is found in low silica igneous rocks. There is a solid solution between nosean and hauyne, which contains calcium.
Additional recommended knowledge
It was first described in 1815 from th Rhineland in Germany and named after the German mineralogist K. W. Nose (1753-1835). The mineral is rare but widespread, found in such diverse localities as ocean islands (e.g., Tahiti) and the La Sal Range in Utah.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Nosean". A list of authors is available in Wikipedia.|