Category borate minerals Crystal system Monoclinic | Strunz classification 6.DA.60 Space group P21/c | |
 | ||
Formula
(repeating unit) (Na,K)2(Sr,Ca)(SO4)[B5O8(OH)]·2H2O Crystal class Prismatic (2/m)
(same H-M symbol) | ||
Fontarnauite is a relatively recently described, rare borate mineral with the formula (Na,K)2(Sr,Ca)(SO4)[B5O8(OH)]·2H2O. It is found in an evaporate boron deposit. It coexists with other evaporate boron minerals, especially probertite. It is monoclinic, crystallizing in the space group P21/c.
It was named in honour of Ramon Fontarnau i Griera, a materials scientist of the University of Barcelona.
References
Fontarnauite Wikipedia(Text) CC BY-SA