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Silicate

Mendeleevite-(Ce)

Cs₆(Ce,REE,Ca)₃₀(Si₇₀O₁₇₅)(OH,F,H₂O)₃₅
Hardness5–5.5
Crystal systemCubic
ClassSilicate
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Mendeleevite-(Ce)

Mendeleevite-(Ce) is an IMA-recognized mineral species in the silicate class, with the chemical formula Cs₆(Ce,REE,Ca)₃₀(Si₇₀O₁₇₅)(OH,F,H₂O)₃₅.

It crystallizes in the cubic crystal system (space group Pm3). It is a member of the Mendeleevite structural group.

Key properties: Mohs hardness 5–5.5; specific gravity 3.12; White streak; Vitreous luster.

IMA symbol Mdl-Ce, IMA status: approved, named in 2009.

Found in a massif composed of a variety of granitic, alkaline granitic and syenitic pegmatites, various hydrothermal rocks (albitites, fenites) and carbonatites.

It is found associated with Pectolite, and subordinate amounts of quartz, aegirine, fluorite, sogdianite, stillwellite-(Ce), reedmergnerite, leucosphenite, aegirine, polylithionite.

The mineral was named to honor Dmitriy Ivanovich Mendeleev (1834-1907), the Russian chemist who among other accomplishments created the Periodic Table of Elements.

Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet. Browse more M minerals or help write this entry.