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Formula: Na8(Al6Si6O24)(HS)2
Tectosilicate (framework silicate), sodalite group
Crystal System: Isometric
Specific gravity: 2.25 measured, 2.255 calculated
Hardness: 5½
Streak: White
Colour: Colourless to pale greyish
Luminescence: Strong orange fluorescence under longwave UV (λ = 330 nm) and weak yellow-orange fluorescence under
shortwave UV (λ = 245 nm)
Environments
Pegmatites
Hydrothermal environments
Sapozhnikovite is a new mineral, approved in 2021, and to date (July 2025) reported only from the type locality.
Localities
At the type locality, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, sapozhnikovite was
discovered in a hydrothermally altered urtite-like rock. The associated
minerals are nepheline, aegirine,
K-feldspar, albite,
kyanoxalite, natrolite,
fluorapatite, fluorcaphite,
lomonosovite (partially or completely altered to
murmanite) and loparite-(Ce).
The sapozhnikovite forms isolated colourless to pale greyish anhedral equant grains up to 5 mm across
(MM 86.49-59).
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