mineral

Fluorite

Calcium Fluoride (CaF2)

Hardness: 4 on Mohs scale; Color: Purple, green, blue, yellow, or clear; Luster: Vitreous (glassy); Crystal Structure: Cubic or Octahedral; Cleavage: Perfect in four directions; Specific Gravity: 3.18

Hardness: 4 on Mohs scale
Color: Purple, green, blue, yellow, or clear
Luster: Vitreous (glassy)

Identified July 20, 2026More mineral →

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Physical properties

Formation & geological history

Formed through hydrothermal activity in veins alongside metallic ores, often in limestone. It can also be found in pegmatites and hot spring deposits.

Uses & applications

Used as a flux in steel making, in the production of hydrofluoric acid, in high-performance telescope and camera lenses, and as a popular decorative gemstone/collectible.

Geological facts

Fluorite is highly fluorescent under ultraviolet light; this property actually derived its name from the mineral. Known as the Most Colorful Mineral in the World.

Field identification & locations

Identified by its softness (can be scratched by a knife), its cubic crystal habit, and its distinctive colors. Common locations include China, Mexico, South Africa, and Illinois, USA.