Fluorite

Physical Properties

Hardness: 4 on Mohs scale; Color: Purple and clear/green (multicolored); Luster: Vitreous (glassy); Crystal Structure: Isometric; Cleavage: Perfect octahedral; Specific Gravity: 3.175–3.184.

Formation & Geological History

Formed through hydrothermal activity, often in veins with metallic ores or in hot spring deposits. It can form in various temperatures and pressures within the Earth's crust.

Uses & Applications

Used as a flux in steel making, in the manufacture of opal glass, as a source for fluorine and hydrofluoric acid, and as a gemstone or ornamental material.

Geological Facts

Fluorite is famous for its wide range of colors and its property of fluorescence, where it glows under ultraviolet light. It is commonly referred to as 'the most colorful mineral in the world.'

Field Identification & Locations

Identify by its vitreous luster, soft hardness (can be scratched by a knife but not a coin), and its distinctive 4-directional cleavage that often produces triangular faces.

Identified on: 4/23/2026

Mode: Standard