mineral

Fluorite with Quartz on Matrix

Calcium Fluoride (CaF2) with Silicon Dioxide (SiO2)

Hardness: Fluorite (4), Quartz (7). Color: Pale purple, clear, and white crystals on a brown/tan earthy matrix. Luster: Vitreous (glassy). Crystal Structure: Isometric/Cubic (Fluorite) and Hexagonal (Quartz). Perfect octahedral cleavage on fluorite.

Hardness: Fluorite (4), Quartz (7)
Luster: Vitreous (glassy)

Identified July 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins created by hot, mineral-rich fluids circulating through rock fractures. This large specimen likely originated from a Mississippi Valley-Type (MVT) deposit or a high-temperature hydrothermal vein system.

Uses & applications

Largely used as a decorative collector's piece. Industrial fluorite is used as a flux in steel making, and in the production of hydrofluoric acid and certain specialty glass.

Geological facts

Fluorite was the original source for the word 'fluorescence' because many specimens glow under ultraviolet light. It is often referred to as 'the most colorful mineral in the world'.

Field identification & locations

Identified in the field by its cubic crystal habit, octahedral cleavage, and lower hardness compared to quartz. Common in Illinois (USA), Mexico, China, and Morocco. Large matrix pieces like this are prized for display.

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