Fontarnauite
Appearance
Fontarnauite | |
---|---|
General | |
Category | Borate minerals |
Formula (repeating unit) | (Na,K)2(Sr,Ca)(SO4)[B5O8(OH)]·2H2O |
Strunz classification | 6.DA.60 |
Crystal system | Monoclinic |
Crystal class | Prismatic (2/m) (same H-M symbol) |
Space group | P21/c |
Identification | |
Color | Light brown |
Cleavage | Perfect {010} |
Mohs scale hardness | 2.5 - 3 |
References | [1][2] |
Fontarnauite is a relatively recently described, rare sulfate, borate mineral with the formula (Na,K)2(Sr,Ca)(SO4)[B5O8(OH)]·2H2O. It is found in an evaporite boron deposit. It coexists with other evaporite boron minerals, especially probertite. It is monoclinic, crystallizing in the space group P21/c.[3][1]
It was named for Ramon Fontarnau i Griera, a materials scientist of the University of Barcelona.[1]