Rimkorolgite Locality: Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula , Murmanskaja Oblast', Northern Region , Russia ( Locality at mindat.org ) Light brown acicular crystals of Rimkorolgite. Field of view 5 mm. Specimen and photo Leon Hupperichs. — Photo: Leon Hupperichs · CC BY-SA 3.0
Rimkorolgite
Rimkorolgite is an IMA-recognized mineral species in the phosphate class, with the chemical formula BaMg₅(PO₄)₄·8H₂O.
It crystallizes in the monoclinic crystal system (space group P2_1/c).
Key properties: Mohs hardness 3; specific gravity 2.67; White streak; Vitreous, silky in aggregates luster; optically biaxial.
IMA symbol Rolg, IMA status: approved, named in 1990.
Found in cavities in dolomitic carbonatites cutting jacupirangite and forsterite-magnetite iron ores in a differentiated alkalic massif.
It is found associated with Collinsite, bobierrite, carbonate-fluorapatite, strontiowhitlockite, pyrite.
The mineral was named to honor Professor Ol’ga Mikhailonova Rimskaya-Korsakova [RIMskaya-KORsakova, OLGa] (1914–1987), mineralogist, St. Petersburg University, St. Petersburg, Russia.