Nosean
A variety of Minerals
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
Market Value Factors
Pricing varies for every rock and mineral, so use these universal factors to gauge Nosean before comparing listings or appraisals.
Size & Weight
Larger, intact specimens usually command higher prices.
Rarity & Demand
Scarce material or popular varieties sell at a premium.
Condition & Finish
Chips, repairs, and heavy wear lower value; clean prep helps.
Treatment & Provenance
Untreated specimens with documented locality are prized.
Nosean Localities Map
See where Nosean is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.
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
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Nosean FAQs
How do I identify Nosean?
Nosean can be identified by its hardness of 5.5 on the Mohs scale, Colorless color. Look for these key characteristics when examining specimens.
What color is Nosean?
Nosean typically appears in Colorless, white, gray, gray-brown, blue, black. Color can vary depending on impurities and formation conditions.
How hard is Nosean?
Nosean has a hardness of 5.5 on the Mohs scale. This gives it moderate hardness.
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