Orangish crystals of the very rare calcium borate mineral pringleite from PCS Mine, Penobsquis, Kings County, New Brunswick, Canada. Pringleite has only been found worldwide in three very close localities in New Brunswick, Canada. Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Pringleite
Pringleite is an IMA-recognized mineral species in the halide class, with the chemical formula Ca₉B₂₆O₃₄(OH)₂₄Cl₄·13H₂O.
It crystallizes in the triclinic crystal system (space group P1).
Key properties: Mohs hardness 3–4; specific gravity 2.22; White streak; Vitreous luster; optically biaxial.
IMA symbol Pri, IMA status: approved, named in 1992.
Rare, in an evaporite deposit.
It is found associated with Hilgardite-1A, halite, ruitenbergite, sylvite, anhydrite, quartz, clays.
The mineral was named to honor Gordon J. Pringle (1944–), mineralogist, Geological Survey of Canada, Ottawa, Canada.