Epidote Mineral Specimen from Les Collades, Lleida, Spain Display Case Goethite is an iron oxyhydroxide

Goethite is an iron oxyhydroxide mineral with the chemical formula FeO(OH)

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Epidote Mineral Specimen from Les Collades, Lleida, Spain Display Case Goethite is an iron oxyhydroxideEpidote is a sorosilicate mineral with the chemical formula Ca(Fe,Al)(SiO)(OH). It is not on the periodic table as a pure element, but its composition includes calcium (Ca), iron (Fe), aluminium (Al), silicon (Si), and hydroxide (OH). It grows in a monoclinic crystal system, commonly forming elongated prismatic crystals with a vitreous to resinous lustre. Epidotes signature pistachio green to brown green shades arise from its iron content, and its