Strontiofluorite
Strontium fluoride — the strontium analogue of fluorite.
Intro adapted from Wikipedia (CC BY-SA).
Strontiofluorite is an IMA-recognized mineral species in the halide class, with the chemical formula SrF₂.
It crystallizes in the cubic crystal system (space group Fm3m). It is a member of the Fluorite structural group.
Key properties: Mohs hardness 4; specific gravity 4.05; White streak; Greasy luster.
IMA symbol Sflr, IMA status: approved, named in 2009.
Found in lenses of sodalite-microcline-aegirine rock within an apatite-rich urtite; produced by intense alteration of primary Sr-bearing minerals by F-rich hydrothermal fluids in a peralkaline parageneses.
It is found associated with Astrophyllite, burbankite, chlorobartonite, fluorite, fluorapatite, polezhaevite-(Ce).
As a Sr-dominant analogue of fluorite.