Nosean

Nosean
Nosean crystal group from Ochtendung, Eifel, Germany
General
Category	Sodalite - (Feldspathoid)
Formula (repeating unit)	Na8Al6Si6O24(SO4)
IMA symbol	Nsn
Strunz classification	9.FB.10
Crystal system	Cubic
Crystal class	Hextetrahedral (43m) H-M symbol: (4 3m)
Space group	P43m

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.

References

• Webmineral data
• Mindat with location data