Formula:
Na4K4Fe2+2Ti8O4(Si4O12)4(OH)4.10-12H2O
Cyclosilicate (ring silicate), labuntsovite group,
labuntsovite supergroup
Crystal System: Monoclinic
Specific gravity: 2.94 measured, 2.93 calculated
Hardness: 5
Colour: Orange
Common impurities: Mg,Mn
Environments
Labuntsovite-Fe occurs in K-feldspar - natrolite
- calcite veinlets in hydrothermally altered nepheline-rich
rock
(Webmin).
Localities
The type locality is the Kirovskii apatite mine, Kukisvumchorr Mountain, Khibiny Massif, Murmansk Oblast, Russia.
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