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Lemmleinite-(Ba) - Kovdor Zheleznyi Mine, Kovdor Massif, Murmansk Oblast, Russia
(#:MINS8327)
Nice thumb sized specimen of the exceedingly rare silicate lemmleinite-Ba from one of only six known localities for the species.This piece hosts dozens of sharp, well-formed, intense orange colored monoclinic crystals of lemmleinite-Ba with white prismatic crystals of natrolite on matrix.Ex Sandro Maggia collection.
Formula :
Na
2
K
2
Ba(Ti,Nb)
4
(Si
4
O
12
)
2
(O,OH)
4
· 5H2O
System:
monoclinic
Hardness:
5½
Rarity:
very rare
Strunz id:VIII/E.7-75 - SILICATES
Name origin:
Named in allusion to its composition with dominant barium, and its relationship to Lemmleinite-K.
Specimen weight:4 gr.
Crystal size:Up to 1 mm
Overall size: 24mm x 20 mm x 16 mm
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