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Formula: (H3O)12Na3(Ca3Mn3)(Na2Fe)Zr3☐Si[Si24O69(OH)3](OH)Cl.H2O
Cyclosilicate (ring silicate), eudialyte group,
manganese- and zirconium- bearing
mineral
Crystal System: Trigonal
Specific gravity: 2.73 measured, 2.722 calculated
Hardness: 5
Streak: White
Colour: Brownish red to reddish orange
Environments
Selsurtite is a new mineral, approved in 2022 and to date (May 2023) reported only from the type locality.
Localities
At the type locality, Selsurt Mountain, Lovozersky District, Murmansk Oblast, Russia, selsurtite was discovered
in metasomatic peralkaline ((Na + K)>Al) rock from the Flora mountain. The associated minerals are
aegirine, albite and
orthoclase, as well as accessory
lorenzenite,
calciomurmanite, natrolite,
lamprophyllite and
sergevanite. Selsurtite occurs as brownish red to reddish orange,
equant or flattened crystals up to 2 mm across and elongate crystals up to 3 cm long
(MM 87.241-251).
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