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  • Eudialyte

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
Table of Contents
  • General Information
  • Eudialyte Colors
  • Countries of Origin

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

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
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

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