LEPIDOCROCITE sur QUARTZ, ANDRANONONDAMBO, MADAGASCAR (miniature)
La lépidocrocite (γ-FeO(OH)), également appelée esmeraldite ou hydrohématite, est un minéral de la famille des oxydes-hydroxydes de fer. Elle présente une structure cristalline orthorhombique, une dureté de 5 et une densité de 4. Son éclat est submétallique et sa trace jaune-brun. Ce minéral, de couleur rouge à brun rougeâtre, se forme généralement par oxydation de matériaux riches en fer immergés dans l'eau. La lépidocrocite est fréquemment associée à l'altération des minéraux de fer primaires et se trouve dans les gisements de minerai de fer, souvent sous forme de dépôts de rouille à l'intérieur des canalisations et réservoirs d'eau en acier vieillissants.
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