cryolithionite

cryolithionite

[‚krī·ō′lith·ē·ə‚nīt]
(mineralogy)
Na3Li3 Al2F12 A colorless mineral that crystallizes in the isometric system; found in the Ural Mountains.
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Associated minerals are: cryolite, cryolithionite, pachnolite, weberite, thomsenolite, prosopite, ralstonite, and fluorite.
General appearance: An intergrowth with cryolite and cryolithionite of anhedral to subhedral grains from several microns to two- to three-hundred microns.
Minerals identified in the pipe are: cryolite, cryolithionite, elpasolite, pachnolite, prosopite, ralstonite, thomsenolite, weberite and a new mineral with the composition [Na.sub.2]LiAI[F.sub.6] that has been named simmonsite.
It also hosts the first occurrence of cryolithionite and simmonsite, and the second known North American occurrence of weberite.
X-ray diffraction, optical, and electron microprobe studies show that this material is actually composed of four different alumino-fluoride minerals: roughly equal amounts of cryolite, cryolithionite, a new mineral having the composition [Na.sub.2]LiAl[F.sub.6] (simmonsite), and less than 1% anhedral elpasolite disseminated throughout the other minerals.
Cryolite, along with cryolithionite and a monoclinic form of [Na.sub.2]LiAl[F.sub.6] (simmonsite), forms the bulk of the alumino-fluoride breccia pipe.
Cryolithionite [Na.sub.3][Li.sub.3][Al.sub.2][F.sub.12]
Cryolithionite is one of three dominant alumino-fluoride minerals, the others being cryolite and simmonsite, in compact, vitreous, white to pale cream-tan masses.
A cell-refinement of 114.6 mm Gandolfi camera X-ray data for the cryolithionite yielded a cell edge ([a.sub.o]) of 12.13(1)[Angstrom] indicating a nearly ideal composition of [Na.sub.3][Li.sub.3][Al.sub.2][F.sub.12].
22 shows discrete crystals of recrystallized cryolithionite.
Electron microprobe and X-ray diffraction analyses of the mixture revealed four minerals to be present: about equal amounts of cryolite, cryolithionite, simmonsite, and trace amounts (about 1%) of elpasolite.
It is also found associated with thomsenolite, topaz, phenakite, cryolithionite and fluorite (Palache et al., 1951) in a cryolite pegmatite at Miass in the Ural Mountains of Russia.