Brown
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Brown Double-Terminated Twinned Calcite from Tonglushan Mine, Hubei, China
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Gemmy Double-Terminated Dogtooth Calcite Twin from Tonglushan Mine, Daye, Hubei, China
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Large Endlichite (Arsenic-bearing Vanadinite) Crystals from Zelidja Mine, Morocco
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Large Goethite after Pyrite “Iron-Cross” Twin from Gachala, Cundinamarca, Colombia
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