Where is Fluorite found?
CaF2
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Open the appFluorite occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Fluorite
Illinois and Kentucky, USA
Historically significant deposits, particularly for purple and yellow fluorite, often associated with lead-zinc mineralization. The Illinois-Kentucky Fluorspar District was once a major global producer.
Derbyshire, England
Famous for 'Blue John' fluorite, a distinctive banded purple and yellow variety, used for ornamental purposes. Occurs in limestone-hosted hydrothermal veins.
Naica, Chihuahua, Mexico
Known for spectacular, large, well-formed fluorite crystals, often associated with lead-zinc-silver deposits.
China
A leading global producer of fluorite, with numerous deposits across various provinces, yielding a wide range of colors and crystal habits.
Germany
Various localities, particularly in the Black Forest and Harz Mountains, have produced fine fluorite specimens.
Spain
Asturias region is known for excellent blue and purple fluorite specimens.
Collecting tips
- Look for Hydrothermal Veins. Fluorite is commonly found in veins cutting through various rock types, especially limestones, dolomites, and granites. Look for areas with evidence of past hydrothermal activity.
- Associated Minerals. Fluorite often co-occurs with quartz, calcite, barite, galena, sphalerite, and chalcopyrite. The presence of these minerals can indicate a potential fluorite deposit.
- Check for Cleavage. Its perfect octahedral cleavage is a key diagnostic feature. Broken pieces will often show characteristic triangular or diamond-shaped facets.
- UV Light. Many fluorite specimens exhibit fluorescence under ultraviolet light, glowing in various colors (often blue, green, or purple). A portable UV lamp can be a useful tool for identification in the field.
- Hardness Test. With a Mohs hardness of 4, fluorite can be scratched by a knife or steel file, but it will scratch gypsum (2) and calcite (3).
Quick Check
- Color:
- Highly variable (purple, blue, green, yellow, colorless, etc.), often banded.
- Luster:
- Vitreous (glassy).
- Streak:
- White.
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