What is Eudialyte?


Eudialyte is a rare cyclosilicate mineral that is often found in Russia, Canada, and Madagascar. It’s primarily used as a gemstone and is popular for its deep red to pinkish-red color.

Eudialyte is a captivating gemstone that comes in shades of deep red to pinkish-red. Its unique appearance and color make it a popular choice for jewelry and decorative items, especially beads and pendants.

Gemstone Properties

Chemical ClassificationInorganic - Silicate (Cyclosilicate)
ColorEudialyte is typically deep red to pinkish, often contrasted with black, brown, or yellowish inclusions.
LusterVitreous to greasy.
TransparencyTransparent to translucent.
OccurrenceRussia (especially the Kola Peninsula), Canada, and Greenland.
FormationEudialyte forms in alkaline igneous rocks, especially nepheline syenites.
DiaphaneityTransparent to translucent
Mohs Hardness5 to 5.5.
Specific Gravity2.74 to 3.10.
Diagnostic PropertiesReddish-pink with black.
Chemical CompositionNa15Ca6(Fe,Mn)3Zr3SiO(O,OH,H2O)3(Si3O9)2(Si9O27)2(OH,Cl)2
Crystal SystemTrigonal
Optical PropertiesBiaxial (-)
Refractive Index1.590 - 1.603
2V angleMeasured: 58°
DispersionNot notably high.