mineral
Green Fluorite
Calcium Fluoride (CaF2)
Hardness: 4 on Mohs scale; Color: typically green in this specimen, but can be purple, yellow, or clear; Luster: Vitreous; Crystal Structure: Isometric (cubic or octahedral); Cleavage: Perfect octahedral.
- Hardness
- 4 on Mohs scale
- Luster
- Vitreous
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Physical properties
Hardness: 4 on Mohs scale; Color: typically green in this specimen, but can be purple, yellow, or clear; Luster: Vitreous; Crystal Structure: Isometric (cubic or octahedral); Cleavage: Perfect octahedral.
Formation & geological history
Formed via hydrothermal activity where hot, mineral-rich fluids flow through fractures in the earth's crust, often associated with lead and zinc ores. Found in various geological ages ranging from Paleozoic to Mesozoic.
Uses & applications
Used in metallurgy as a flux to lower the melting point of raw materials, in the production of hydrofluoric acid, in high-performance telescope lenses, and widely used in jewelry and lapidary arts.
Geological facts
Fluorite gave its name to the phenomenon of fluorescence because many specimens glow under ultraviolet light. It is often called the most colorful mineral in the world.
Field identification & locations
Identified in the field by its Mohs hardness of 4 (softer than glass) and its distinctive cubic habit or octahedral cleavage fragments. Common in China, Mexico, and the USA (notably Illinois).
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Gypsum (variety Selenite or Alabaster)
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Mineral
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Mineral/Rock
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igneous