mineral

Eudialyte in Matrix

Eudialyte [Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2]

Hardness: 5-5.5; Color: Magenta-pink, red, or brownish-red crystals in a white/grey/black matrix; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: Poor/indistinct

Hardness: 5-5
Luster: Vitreous

Identified April 14, 2026More mineral →

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Physical properties

Hardness: 5-5.5; Color: Magenta-pink, red, or brownish-red crystals in a white/grey/black matrix; Luster: Vitreous; Crystal Structure: Trigonal; Cleavage: Poor/indistinct

Formation & geological history

Formed in alkaline igneous rocks, typically nepheline syenites and pegmatites. It is a rare cyclosilicate mineral formed during the late stages of magmatic differentiation.

Uses & applications

Primarily a collector's mineral and a semi-precious stone for jewelry (cabochons) and decorative spheres. It is also a potential minor source of zirconium and rare earth elements.

Geological facts

Eudialyte was first described in 1819 from specimens found in Greenland. Its name comes from the Greek words 'eu' and 'dialytos', meaning 'well-decomposable,' because it dissolves easily in acids.

Field identification & locations

Look for distinctive magenta to deep red crystalline patches embedded in a lighter grey or white silicate matrix. It is commonly found in the Kola Peninsula (Russia), Mont Saint-Hilaire (Canada), and Greenland.

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