Fontarnauite is a relatively recently described, rare sulfate, borate

mineral In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid chemical compound with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. ( ...

with the chemical formula . It is found in an evaporite boron deposit. It coexists with other evaporite boron minerals, especially probertite. It is

monoclinic In crystallography, the monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described by vectors of unequal lengths, as in the orthorhombic s ...

, crystallizing in the space group ''P''2₁/''c''.García-Veigas, J., Rosell, L., Alcobé, X., Subias, I., Ortí, F., Gündoğan, İ., and Helvaci, C., 2010. Fontarnauite, a New Sulphate-Borate Mineral from the Emet Borate District (Turkey). Revista de la Sociedad Española de Mineralogía 13, 97-98Mindat
/ref> It was named for Ramon Fontarnau i Griera, a materials scientist of the

University of Barcelona The University of Barcelona ( ca, Universitat de Barcelona, UB; ; es, link=no, Universidad de Barcelona) is a public university located in the city of Barcelona, Catalonia, in Spain. With 63,000 students, it is one of the biggest universities i ...

References

Borate minerals Sulfate minerals Sodium minerals Strontium minerals Monoclinic minerals Borate sulfates Minerals in space group 14 {{mineral-stub