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Octahedral Fluorite Crystals on Quartz

Octahedral fluorite crystals are naturally formed mineral crystals of fluorite (CaF₂) that grow in the shape of an octahedron — a geometric form with eight triangular faces , resembling two pyramids joined at their bases.

Octahedral Fluorite Crystals

Bipyramidal Octahedral Fluorite. From De'an Mine, Wushan, Jiangxi Province, China
Photo Copyright © DI Rudolf Watzl

What is Fluorite?

Fluorite is a halide mineral composed of calcium fluoride (CaF₂). It's one of the most visually striking minerals due to its vivid colors, glassy luster, and well-defined crystal shapes.

Chemical Composition : Calcium fluoride (CaF₂)
Crystal System : Isometric (cubic)
Hardness : 4 on the Mohs scale
Color : Highly variable — purple, green, yellow, blue, pink, colorless, etc.
Fluorescence : Often glows under UV light (fluorescence is named after fluorite!)

What Is an Octahedron?

An octahedron is a polyhedron with:

8 triangular faces
6 vertices
12 edges

In nature, minerals like fluorite often form perfect octahedral crystals , especially when they have space to grow freely in geodes or vugs (open cavities in rocks).

Octahedral fluorite crystals from De’an Mine, Jiangxi, China

Natural bipyramidal octahedral fluorite crystals from De’an Mine, Jiangxi, China

Many octahedral fluorite crystals show color zoning — layers or bands of different colors within the same crystal. This happens because:

Trace elements change during crystal growth
Radiation exposure affects color centers
Temperature and chemical conditions fluctuate
Purple and green are among the most common color combinations.

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