Nosean

A variety of Minerals

Nosean specimen - rock identification

What is Nosean?

Nosean, also known as noselite, is a mineral of the feldspathoid group with formula: Na8Al6Si6O24(SO4). H2O. 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. It was first described in 1815 from the 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.

Optical Properties

Optical Character
Isotropic

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Nosean Localities Map

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North ZoneCentral RidgeSouth Basin

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Quick Facts

Physical Properties

Color
Colorless, white, gray, gray-brown, blue, black
Hardness (Mohs)
5.5
Density
2.21 g/cm³
Streak
Reddish

Chemical Properties

Chemical Formula
Na8(Al6Si6O24)(SO4) · H2O
Elements
Al, H, Na, O, S, Si

Also Known As

NoseanNoseaneNosianNosite
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