Platy white crystal aggregates of the extremely rare strontium borate mineral strontioborite from the type and only known locality worldwide in Kazakhstan (Chelkar Salt Dome, Aksai Valley, Shalkar, Aktobe Province, Kazakhstan). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Strontioborite
Strontioborite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Sr[B₈O₁₁(OH)₄].
It crystallizes in the monoclinic crystal system (space group P2_1).
Key properties: specific gravity 2.4; optically biaxial.
IMA symbol Srbo, IMA status: approved, named in 2020.
Found in the insoluble residue from a salt dome.
It is found associated with Ginorite, boracite, halurgite, kieserite, anhydrite, preobrazhenskite, boracite, aksaite, metaborite (Chelkar salt dome, Kazakhstan).
The name refers to STRONTIum and BORate in the essential composition.