Nosean, also known as noselite, is a mineral of the

feldspathoid The feldspathoids are a group of tectosilicate minerals which resemble feldspar Feldspar ( ; sometimes spelled felspar) is a group of rock-forming aluminium tectosilicate minerals, also containing other cations such as sodium, calcium, pota ...

group with formula: . It forms isometric crystals of variable color: white, grey, blue, green, to brown. It has a

Mohs hardness The Mohs scale ( ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fair ...

of 5.5 to 6 and a

specific gravity Relative density, also called specific gravity, is a dimensionless quantity defined as the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity for solids and liquids is nea ...

of 2.3 to 2.4. It is

fluorescent Fluorescence is one of two kinds of photoluminescence, the emission of light by a substance that has absorbed light or other electromagnetic radiation. When exposed to ultraviolet radiation, many substances will glow (fluoresce) with color ...

. It is found in low-silica

igneous rock Igneous rock ( ), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rocks are formed through the cooling and solidification of magma or lava. The magma can be derived from partial ...

s. There is a solid solution between nosean and

hauyne Hauyne or haüyne, also called hauynite or haüynite ( ), old name ''Azure spar'',The Edinburgh Encyclopaedia, 1st American ed., Volume 13. — J. and E. Parker edition, 1832. is a rare tectosilicate sulfate mineral with endmember formula . As ...

, which contains calcium. It was first described in 1815 from the

Rhineland The Rhineland ( ; ; ; ) is a loosely defined area of Western Germany along the Rhine, chiefly Middle Rhine, its middle section. It is the main industrial heartland of Germany because of its many factories, and it has historic ties to the Holy ...

Germany Germany, officially the Federal Republic of Germany, is a country in Central Europe. It lies between the Baltic Sea and the North Sea to the north and the Alps to the south. Its sixteen States of Germany, constituent states have a total popu ...

and named after the German

mineralogist Mineralogy is a subject of geology specializing in the scientific study of the chemistry, crystal structure, and physical (including optical mineralogy, optical) properties of minerals and mineralized artifact (archaeology), artifacts. Specific s ...

K. W. Nose (1753–1835). The mineral is rare but widespread, found in such diverse localities as ocean islands (e.g.,

Tahiti Tahiti (; Tahitian language, Tahitian , ; ) is the largest island of the Windward Islands (Society Islands), Windward group of the Society Islands in French Polynesia, an overseas collectivity of France. It is located in the central part of t ...

) and the La Sal Range in

Utah Utah is a landlocked state in the Mountain states, Mountain West subregion of the Western United States. It is one of the Four Corners states, sharing a border with Arizona, Colorado, and New Mexico. It also borders Wyoming to the northea ...

References

Webmineral data

Feldspathoid Sodalite group Sodium minerals Aluminium minerals Sulfate minerals Cubic minerals Minerals in space group 215 {{silicate-mineral-stub