Fluorite

Real mineral · common · CaF₂

Calcium fluoride that crystallises in perfect cubes and octahedra. Occurs in a wide spectrum of colours due to trace element impurities and radiation exposure. The term fluorescence derives from this mineral.

Identity

Formula

CaF₂

Chemical class

halide

Also known as

Fluorspar, Blue John (banded variety)

Crystallography

Crystal system

cubic

Habits

cubic, octahedral, massive

Fracture

subconchoidal

Physical properties

Mohs hardness

4

Density

3.18 g/cm³

Luster

vitreous

Colors

purple, blue, green, yellow, colorless, pink, brown, black

Streak

white

Transparency

transparent, translucent

Geology

Origins

hydrothermal

Host rocks

limestone, granite, dolomite

Associated minerals

Quartz, Calcite, Barite, Galena

Geography

China, Mexico, South Africa, Spain, UK

Classification

Rarity

common

Gem quality

Yes

Arcane properties

Affinity

arcane, mind

Effects

mind, warding

Planar origin

Material Plane

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