Gadolinite | Gemopedia

Ranging from green to brownish black in color, gadolinite is a mineral that counts Russia as one of its primary sources. Interestingly, gadolinite is prized for the two rare earth elements it contains: yttrium and cerium.
Colors
Black, Greenish Black, Brown, Green

Gadolinite Classification

Common Name

Gadolinite

Species

Gadolinite

Variety

Colors

Black, Greenish Black, Brown, Green

Alternate Names

Gemstone Groups

Key Separations

OTL RI and appearance.

Comments

Might be radioactive.

Gadolinite Optical Properties

Transparency

Transparent - Opaque

Refractive Index

Over the Limit 1.77-1.82

Birefringence

0.01-0.04

Optic Character

Biaxial

Optic Sign

Positive

Polariscope Reaction

Doubly Refractive (DR)

Fluorescence

SWUV:
LWUV:

CCF Reaction

Pleochroism

None

Dispersion

Strength: strong fire

Comments

Gadolinite Chemistry & Crystallography

Chemical Name

Chemical Formula

Y2Fe2+Be2(Si2O10) or (Ce,La, Nd,Y)2Fe2+Be2(Si2O10)

Synthesis

Crystal System

Monoclinic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline to Aggregate

Comments

Gadolinite Characteristic Physical Properties

Hardness

6.5-7

Streak

White And Greenish Gray

Specific Gravity

4-4.65

Toughness

Poor

Inclusions

Luster

Vitreous

Stability

Fracture

Conchoidal, Splintery

Cleavage

None

Comments

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