Locality: Viitaniemi pegmatite, Eräjärvi area, Orivesi, Western and Inner Finland Region, Finland Pink morinite on backlight. Image width 18 mm. — Photo: Jyrki Autio · CC0
Morinite
Morinite is an IMA-recognized mineral species in the phosphate class, with the chemical formula NaCa₂Al₂(PO₄)₂(OH)F₄·2H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/m).
Key properties: Mohs hardness 4–4.5; specific gravity 2.94–2.96; White streak; Vitreous to pearly on cleavages luster; optically biaxial.
IMA symbol Mori, IMA status: approved, named in 1891.
An uncommon late-stage mineral in complex granite pegmatites.
It is found associated with Montebrasite, apatite, augelite, wardite, wavellite, cassiterite.
The mineral was named to honor Mr. E.A. Morineau, Director of the tin mine, Montebras, France, who supplied the first specimens.