Gray gemstones

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Tennantite, Cu12As4S13, from Les Ferreres Mine, Rocabruna, Camprodon, Ripollès, Girona, Catalonia, Spain Tennantite is a complex copper arsenic sulfosalt mineral with the chemical formula Cu12As4S13. It is part of the tetrahedrite group and is known for its deep gray to black color and metallic luster. Tennantite typically occurs in hydrothermal veins associated with other sulfide minerals. **Key Characteristics of Tennantite:** - **Color**: Deep gray to black. - **Crystal Habit**: Crystals... Catalonia Spain, Rock Minerals, S Photo, Pretty Rocks, Crystal Magic, Beautiful Rocks, Mineral Stone, Minerals And Gemstones, Rocks And Gems

Tennantite, Cu12As4S13, from Les Ferreres Mine, Rocabruna, Camprodon, Ripollès, Girona, Catalonia, Spain Tennantite is a complex copper arsenic sulfosalt mineral with the chemical formula Cu12As4S13. It is part of the tetrahedrite group and is known for its deep gray to black color and metallic luster. Tennantite typically occurs in hydrothermal veins associated with other sulfide minerals. **Key Characteristics of Tennantite:** - **Color**: Deep gray to black. - **Crystal Habit…

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