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Håleniusite-(La)
Håleniusite-(La) (yellow) with other minerals
General
Category	Mineral
Formula (repeating unit)	(La,Ce)OF
IMA symbol	Hål-La
Strunz classification	3/A.08-25
Crystal system	Isometric
Space group	Fm3m (No. 225)
Unit cell	178.26 ų (Calculated from Unit Cell)
Identification
Formula mass	174.90 gm
Colour	Lemon yellow to ochre yellow
Luster	Dull, earthy
Streak	Light yellow
Diaphaneity	Translucent
Specific gravity	6.5
Density	6.5 g/cm (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. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.

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