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Betalomonsovite with Murmanite - Apatitovyi Tsirk, Rasvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
(#:MINS7849)
Specimen with rare yellow β-Lomonosovite with pink violet lamellar crystals in association.
Formula :
Na
6
☐
4
Ti
4
(Si2O
7
)
2
[PO
3
(OH)][PO2(OH)2]O
2
(OF)
System:
triclinic
Hardness:
2-3
Rarity:
extremely rare
Strunz id:VIII - SILICATES
Name origin:
In allusion to its close relation with Lomonosovite. First described by Gerasimovskiy and Kazakova (1962) from two pegmatites on the left and right banks of the Tyul bnyunuai River, Lovozero massif, Kola, Russia. The status of betalomonosovite has been much discussed cause to difficulties of obtaining valid results on structure and chemical analysis. The poor quality of the crystals was related to an extensive cation and anion disorder present in the structure, including H2O (Sokolova et al. 2015). Betalomonosovite was, as a result discredited by IMA in 2013 (removed from the IMA list). Later Sokolova et al (2015) succeeded in refining the structure. Based on their work, betalomonosovite was reapproved by IMA in 2015 (IMA 14-J) (Sokolova et al. 2015). Samples from Pyalkimporr Mountain, Lovozero Massif were used in the study of Sokolova et al 2015).-
Specimen weight:35 gr.
Crystal size:aggregates micro-xls
Overall size: 48mm x 25 mm x 27 mm
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