Eudialyte

Eudialyte

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: November 2021
Eudialyte Polished Eudialyte Rough Eudialyte Jewelry

Discovered 1819 in Greenland, this gemstone is usually found in massive forms in host rocks. Eudialyte is an extremely rare and complex mineral that occurs in red-violets, pinks, blues, yellows and browns. Well-formed crystals are rare, and opaque material is often fashioned in cabochons.

General Information

Common Name
Eudialyte
Species
Eudialyte
Transparency
Translucent - Opaque
Dispersion
Strength: None
Refractive Index
1.591-1.633
Birefringence
0.003-0.01
Optic Character
Uniaxial
Optic Sign
Positive
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert
LWUV: Inert
Pleochroism
Unobservable
Hardness
5-5.5
Streak
White To Pale Pink
Specific Gravity
2.740-3.000
Toughness
Poor
Luster
Vitreous, Dull
Stability
Poor
Fracture
Uneven
Cleavage
Perfect, in one direction, Poor, in one direction
Chemical Formula
Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2
Crystal System
Trigonal
Chemistry Classification
Silicate

Eudialyte Colors

  • Blue Eudialyte
    Blue
  • Pink Eudialyte
    Pink
  • Multi-color Eudialyte
    Multi-color
  • Red Eudialyte
    Red
  • Orange Eudialyte
    Orange
  • Yellow Eudialyte
    Yellow
  • Brown Eudialyte
    Brown
  • Purple Eudialyte
    Purple

Countries of Origin

Russian Federation; Unknown