Color Change Fluorite | Gemopedia

Fluorite crystals occur in white, black, clear, and various shades of every color in the rainbow. Color change fluorite is rare, but has been discovered, usually with a blue to purple change. To observe this natural phenomenon, view your gemstone interchangeably in natural and incandescent lighting environments.
Colors
Violet, Blue

Color Change Fluorite Classification

Common Name

Color Change Fluorite

Species

Fluorite

Variety

Color Change Fluorite

Colors

Violet, Blue

Alternate Names

Gemstone Groups

Key Separations

Color change, refractive index, specific gravity, color zoning and possibly cleavage

Comments

Color shift blue to violet or purple to reddish purple.

Color Change Fluorite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

1.434-1.434
Tolerance:(+0.001/-0.001)

Birefringence

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Variable, but can be strong blue violet
LWUV: Variable, but can be strong blue violet

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.007

Comments

Color Change Fluorite Chemistry & Crystallography

Chemical Name

calcium fluoride

Chemical Formula

CaF2

Synthesis

Crystal System

Cubic

Classification

Halide

Nature

Natural

Crystallinity

Crystalline

Comments

Color Change Fluorite Characteristic Physical Properties

Hardness

4

Streak

White

Specific Gravity

3-3.25 Typical:3.18

Toughness

Poor

Inclusions

Fluorite will sometimes have triangular negative crystals, mineral inclusions, color zoning, healing cracks 2-phase and 3-phase inclusions and liquid inclusions. Might have pits or scratches on surface.

Luster

Vitreous

Stability

Fair

Fracture

Conchoidal, Step-Like

Cleavage

Perfect, in four directions

Comments

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