Letnikovite-(Ce)

letnikovite-(Ce)

sokolovaite

odigitriaite

zeravshanite

Images

Formula: (Na◻)Ca₂Ce₂[Si₇O₁₇(OH)]F₄(H₂O)₄
Inosilicate (chain silicate), cerium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.847 calculated
Hardness: 4
Streak: White
Colour: Colourless
Luminescence: No fluorescence under UV
Environments

Pegmatites

Letnikovite-(Ce) is a new mineral, approved in 2023 and to date (February 2024) reported only from the type locality.

Localities

At the type locality, the Dara-i-Pioz Massif, Districts of Republican Subordination, Tajikistan, letnikovite-(Ce) occurs in a quartzolite-like peralkaline pegmatite, as isolated prismatic grains up to 0.03 × 0.1 mm in a quartz–pectolite aggregate. Associated minerals are quartz, fluorite, pectolite, baratovite, aegirine, leucosphenite, neptunite, reedmergnerite, orlovite, sokolovaite, mendeleevite-(Ce), odigitriaite, pekovite, zeravshanite, kirchhoffite and garmite (MM 87.807-818).

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