mineral
Fluorite
Calcium Fluoride (CaF2)
Hardness: 4 on Mohs scale; Color: Green (in this specimen), can lead to purple, blue, or yellow; Luster: Vitreous; Crystal Structure: Isometric (cubic); cleavage: perfect octahedral; Specific Gravity: 3.175–3.56.
- Hardness
- 4 on Mohs scale
- Luster
- Vitreous
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Physical properties
Hardness: 4 on Mohs scale; Color: Green (in this specimen), can lead to purple, blue, or yellow; Luster: Vitreous; Crystal Structure: Isometric (cubic); cleavage: perfect octahedral; Specific Gravity: 3.175–3.56.
Formation & geological history
Formed through hydrothermal activity, often in veins with metallic ores or in sedimentary rocks like limestone. It precipitates as hot, mineral-rich fluids cool.
Uses & applications
Used as a flux in steel making, in the production of hydrofluoric acid, high-quality camera lenses (due to low dispersion), and for decorative carvings or jewelry.
Geological facts
Fluorite is highly fluorescent under UV light; the term 'fluorescence' is actually derived from the name of the mineral fluorite itself.
Field identification & locations
Identify by its cubic crystal habit, perfect cleavage into octahedrons, and its ability to be scratched by a steel pocketknife while scratching a copper coin. Commonly found in China, Mexico, and the UK.
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Metamorphic
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metamorphic
Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
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igneous