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Fluornatromicrolite - Shigar Valley, Skardu District, Baltistan, Gilgit-Baltistan (Northern Areas), Pakistan
(#:MINS9278)
Honey-yellow fluornatromicrolite octahedra with adamantine luster up to 5 mm on muscovite xls matrix. Fluornatromicrolite is a rare tantalum oxide with fluorine redefined from "microlite" in 1998 and is typically found in pegmatites.
Formula :
(Na
1.5
Bi
0.5
)Ta
2
O
6
F
System:
cubic
Hardness:
5-5½
Rarity:
rare
Strunz id:IV/C.18-10 - OXIDES and HYDROXIDES
Name origin:
Named after the chemical composition. It was first approved as a new species by CNMMN, IMA in 1998 (IMA1998-018). But at the time the name was given, although approved, it was not according to the nomenclature at the time (Hogarth 1977). Cause to controversies about the mineral and the nomenclature of the pyrochlore supergroup, the publication was delayed for several years. It was first published by Witzke et al. (2011). Now the name is approved according to the new nomenclature of the pyrochlore supergroup (Atencio et al. 2010).
Specimen weight:15 gr.
Crystal size:5 mm
Overall size: 35mm x 25 mm x 27 mm
Our Price:€ 54,00
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