Color-Change Garnet | Gemopedia

Color change garnets are among the rarest, most interesting of all gemstones. This phenomenal gem is in fact a mixture of garnet species. You can observe color change in this gem by viewing it interchangeably in natural and incandescent light.
Colors
Blue, Teal, Greenish Blue, Pink To Red

Color-Change Garnet Classification

Common Name

Color-Change Garnet

Species

Pyrope-Spessartite

Variety

Color-Change Garnet

Colors

Blue, Teal, Greenish Blue, Pink To Red

Alternate Names

Gemstone Groups

Garnet

Key Separations

RI, SR nature, magnification, and possibly spectrum. Lack of pleochroism makes clear separation from alexandrite

Comments

Green-blue to teal in color stones are presumed to be colored by vanadium and chromium.Stones are generally intense pink to red under incandescent light and greenish yellow in daylight or fluorescent light.

Color-Change Garnet Optical Properties

Transparency

Transparent

Refractive Index

1.75-1.78

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR) With ADR

Fluorescence

SWUV: Inert
LWUV: Inert

CCF Reaction

Pleochroism

None

Dispersion

Strength: moderate fire Value: 0.022

Comments

Color-Change Garnet Chemistry & Crystallography

Chemical Name

magnesium aluminium garnet or manganese aluminium garnet

Chemical Formula

((Mg, Mn)3Al2(SiO4)3)

Synthesis

Crystal System

Cubic

Classification

Silicate

Nature

Natural

Crystallinity

Crystalline

Comments

Color-Change Garnet Characteristic Physical Properties

Hardness

7-7.5

Streak

Specific Gravity

3.78-3.85

Toughness

Good

Inclusions

Color-change garnet is a type II clarity stone. Stones sometimes contains rutile, apatite and pyrite mineral inclusions and intersecting needles.

Luster

SubAdamantine

Stability

Good

Fracture

Conchoidal

Cleavage

None

Comments

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