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Phosphate

Deloneite

(Na₀.₅REE₀.₂₅Ca₀.₂₅)(Ca₀.₇₅REE₀.₂₅)Sr₁.₅(CaNa₀.₂₅REE₀.₂₅)(PO₄)₃F₀.₅(OH)₀.₅
Crystal systemHexagonal
ClassPhosphate
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Deloneite specimen

Greenish and yellowish crystals of the rare REE mineral deloneite from the type and only known locality worldwide in Kola peninsula, Russia (Koashva Mountain, Khibiny Massif, Murmansk Oblast, Russian Federation). Ex. Erich Laskowski collection (USA). — Photo: David Hospital · CC BY 4.0

Deloneite

Deloneite is an IMA-recognized mineral species in the phosphate class, with the chemical formula (Na₀.₅REE₀.₂₅Ca₀.₂₅)(Ca₀.₇₅REE₀.₂₅)Sr₁.₅(CaNa₀.₂₅REE₀.₂₅)(PO₄)₃F₀.₅(OH)₀.₅.

It crystallizes in the hexagonal crystal system (space group P6_3). It is a member of the Apatite structural group.

IMA symbol Dln, IMA status: approved, named in 1995.

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 D minerals or help write this entry.