Tectosilicate (framework silicate), sodalite group
Specific gravity: 2.25
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)
Sapozhnikovite is a new mineral, approved in 2021, and to date (March 2022) reported only from the type locality.
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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