Eudialyte | Gemopedia

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.
Colors
Red, Pink, Reddish Brown, Brown, Yellow, Yellowish Brown

Eudialyte Classification

Common Name

Eudialyte

Species

Eudialyte

Variety

Colors

Red, Pink, Reddish Brown, Brown, Yellow, Yellowish Brown

Alternate Names

Gemstone Groups

Key Separations

RI

Comments

Might be mildly radioactive due to Cerium content.

Eudialyte Optical Properties

Transparency

Translucent - Opaque

Refractive Index

1.591-1.633

Birefringence

0.003-0.01

Optic Character

Uniaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

Unobservable

Dispersion

Strength: none

Comments

Eudialyte Chemistry & Crystallography

Chemical Name

Chemical Formula

Na4(Ca,Ce)2(Fe,Mn,Y)ZrSi8O22(OH,Cl)2

Synthesis

Crystal System

Trigonal

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Eudialyte Characteristic Physical Properties

Hardness

5-5.5

Streak

White To Pale Pink

Specific Gravity

2.74-3

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Poor

Fracture

Uneven

Cleavage

Perfect, in one direction, Poor, in one direction

Comments

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