Rutile, Limonite

Unknown Owner

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This most interesting pseudomorph is fascinating on both sides. On the back side, limonite/goethite has totally replaced a carbonate mineral, most likely siderite but possibly dolomite or calcite I suppose. On the front or display side, rutile crystals, some in a reticulated twinning pattern, totally cover the specimen by the dozens. The rutile is easy to spot since it exhibits a bright metallic luster and flashes of brilliant red! 11.1 x 10.8 x 4 cm