Parallel aggregate of two laminar and very sharp Hydroxylbastnäsite-(Ce) crystals, between transparent and translucent, with deep orangey color set on a massive Calcite matrix with small Dolomite and mica crystal. Formerly classified as Bastnäsite-(Ce), the samples from Trimouns have been recently determined to be Hydroxylbastnäsite-(Ce)
Formula :
(Ce,La)(CO3)(OH,F)
System: hexagonal Hardness:4-4½ Rarity:very rare
Strunz id:V/C.7-20 -
NITRATES, CARBONATES and BORATES
Name origin: For the locality at the Bastnäs mines, Riddarhyttan, Skinnskatteberg, Västmanland, Sweden, plus the "Hydroxyl" prefix due to the dominance of the hydroxyl radical over fluorine and the "-(Ce)" suffix due to the dominance of cerium in the composition.
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 Specimen weight:32 gr.
 Crystal size:3.5 mm wide
 Overall size: 32mm x 32 mm x 28 mm
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