Fluorite | Gemopedia

A plentiful, affordable, and colorful gem, many consider fluorite one of the most popular collector's stones worldwide. Fluorite often has excellent clarity and crosses the entire color spectrum. One of the most famous fluorescent minerals, fluorite often requires no type of treatment to enhance its appearance. Also prized for its color-change and distinctive multi-color banded varieties, this beautiful stone has so many appealing features, it's no wonder that Roman historian Pliny the Elder named fluorite his "most precious substance."
Alternate
Names
Fluorspar, Rainbow Fluorite
Colors
Green, Blue, Brown, Yellow, Orange, Pink, Purple, Violet, Parti Colored, Colorless

Fluorite Classification

Common Name

Fluorite

Species

Fluorite

Variety

Colors

Green, Blue, Brown, Yellow, Orange, Pink, Purple, Violet, Parti Colored, Colorless

Alternate Names

Fluorspar, Rainbow Fluorite

Gemstone Groups

Key Separations

refractive index, specific gravity, color zoning and possibly cleavage

Comments

Rainbow fluorite is banded and can be found in various shades of yellow, green, purple, white and brown. Stones are often irradiated to improve color.

Fluorite Optical Properties

Transparency

Transparent - Translucent

Refractive Index

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

Birefringence

0-0

Optic Character

NA

Optic Sign

NA

Polariscope Reaction

Singly Refractive (SR)

Fluorescence

SWUV: Variable
LWUV: Variable

CCF Reaction

Pleochroism

None

Dispersion

Strength: weak fire Value: 0.007

Comments

Fluorite Chemistry & Crystallography

Chemical Name

calcium fluoride

Chemical Formula

CaF2

Synthesis

Crystal System

Cubic

Classification

Halide

Nature

Natural

Crystallinity

Crystalline

Comments

Fluorite Characteristic Physical Properties

Hardness

4

Streak

White

Specific Gravity

3-3.25 Range:0.07/-0.18 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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