Sergevanite

sergevanite

arfvedsonite

eudialyte

steenstrupine-(Ce)

Images

Formula: Na₁₅(Ca₃Mn₃)(Na₂Fe)Zr₃Si₂₆O₇₂(OH)₃.H₂O
Cyclosilicate (ring silicate), eudialyte group, manganese- and zirconium- bearing mineral
Crystal System: Trigonal
Specific gravity: 2.90 measured, 2.906 calculated for the empirical formula
Hardness: 5
Streak: White
Colour: Yellow to orange-yellow
Luminescence: Not fluorescent under long wave or short wave UV
Environments

Plutonic igneous environments

Sergevanite is a relatively new mineral, approved in 2019 and to date (February 2024) reported only from the type locality.

Localities

At the type locality, the Mine dump, Karnasurt mine, Karnasurt Mountain, Lovozersky District, Murmansk Oblast, Russia, sergevanite is an accessory component of highly agpaitic foyaite. It occurs as anhedral grains up to 1.5 mm across and forms outer zones of some eudialyte grains. Sergevanite distinctly differs from associated red eudialyte as it is yellow to orange-yellow in colour. Its lustre is vitreous, and its streak is white. Associated minerals are microcline, albite, nepheline, arfvedsonite, aegirine, eudialyte, lamprophyllite, fluorapatite, steenstrupine-(Ce), ilmenite and sphalerite. Sergevanite crystallised after eudialyte (CM 58.4.421-436).
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