Where is Fluorite found?
Fluorite (Calcium Fluoride)
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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
China
Leading producer, with significant deposits in Hunan, Zhejiang, and Inner Mongolia, yielding a wide range of colors and crystal habits.
Mexico
Known for large, well-formed crystals, particularly from the Naica Mine (Chihuahua) and various localities in San Luis Potos.
United States
Historically important deposits in Illinois and Kentucky (Illinois-Kentucky Fluorspar District), and notable occurrences in Colorado, New Hampshire, and New Mexico.
United Kingdom
Classic localities in Derbyshire (Blue John fluorite) and Weardale (County Durham), famous for deep purple and blue specimens.
Germany
Historical mining regions like the Black Forest and Saxony have produced fine fluorite specimens.
Collecting tips
- Look for Hydrothermal Veins. Fluorite is commonly found in hydrothermal veins, often associated with quartz, calcite, barite, and various sulfide minerals. Examine mine dumps and outcrops in areas known for metallic ore deposits.
- Check for Octahedral Cleavage. A key diagnostic feature is its perfect octahedral cleavage. If you find a broken piece, look for smooth, flat surfaces that meet at characteristic angles, forming triangular or diamond shapes.
- Observe Color and Transparency. Fluorite's vibrant colors and transparency are often distinctive. Look for glassy, translucent to transparent crystals or masses. Color zoning is also a good indicator.
- Test Hardness. With a Mohs hardness of 4, fluorite can be scratched by a knife blade or steel file, but it will scratch gypsum (2) and calcite (3). This helps differentiate it from harder minerals like quartz (7).
- UV Light (Optional). Many fluorite specimens exhibit fluorescence under ultraviolet light, glowing in various colors (often blue or green). While not all fluorite fluoresces, it can be a helpful identification tool if available.
Quick Check
- Color:
- Highly variable (purple, blue, green, yellow, colorless, etc.)
- Luster:
- Vitreous (glassy)
- Streak:
- White
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