Chemistry:Håleniusite-(La)

From HandWiki
Håleniusite-(La)
Håleniusite-(La)-704037.jpg
Håleniusite-(La) (yellow) with other minerals
General
CategoryMineral
Formula
(repeating unit)
(La,Ce)OF
Strunz classification3/A.08-25
Crystal systemIsometric
Space groupFm3m (No. 225)
Unit cell178.26 ų (Calculated from Unit Cell)
Identification
Formula mass174.90 gm
ColourLemon yellow to ochre yellow
|re|er}}Dull, earthy
StreakLight yellow
DiaphaneityTranslucent
Specific gravity6.5
Density6.5 g/cm3 (Measured)

Håleniusite-(La), chemical formula (La,Ce)OF. is a yellow isometric mineral. It has a dull, earthy lustre. The geological setting of håleniusite-(La) is in vugs and leaching zones of massive ferriallanite-(Ce), intimately intergrown with cerite-(Ce) and bastnäsite-(La).

It was discovered in 1986 at Bastnäs mines, Riddarhyttan, Skinnskatteberg, Västmanland, Sweden and named in honour of Ulf Hålenius, director of the mineralogy department at the Swedish Museum of Natural History in Stockholm, Sweden.

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode2021MinM...85..291W.