White crystal of the very rare mineral griceite (LiF) from the type locality in the famous Mont Saint Hilaire quarries (Mont Saint-Hilaire, Montérégie, Québec, Canada). Ex Vandenbroucke Museum collection from Waregem, Belgium. — Photo: David Hospital · CC BY 4.0
Griceite
The rare mineral form of lithium fluoride — a colorless cubic mineral from lithium pegmatites.
Intro adapted from Wikipedia (CC BY-SA).
Griceite is an IMA-recognized mineral species in the halide class, with the chemical formula LiF.
It crystallizes in the cubic crystal system (space group Fm3m). It is a member of the Rocksalt structural group.
Key properties: Mohs hardness 4.5; specific gravity 2.62; White streak; Vitreous or porcelaneous to waxy or dull luster.
IMA symbol Gri, IMA status: approved, named in 1986.
Found in sodalite inclusions in hornfels in association with an intrusive alkalic gabbro-syenite complex.
It is found associated with Sodalite, ussingite, villiaumite, eudialyte, sphalerite, serandite, lovozerite, vuonnemite.
The mineral was named to honor Dr. Joel Denison Grice (1946–), Curator of Minerals at the Canadian Museum of Nature [National Museum of Natural Sciences], Ottawa, Canada.