Siderite
Jones Falls Quarries, Baltimore City, Maryland, USA
7.4 x 4.9 x 2.0 cm. Siderite specimens are very rare from this old gneiss quarry in Baltimore. A lustrous, dark gray coating covers the curved, helmet-shaped, translucent, amber siderite crystals that very richly line the sculptural vug. Old-time, very rare and rich material from the Columbia University-American Museum of Natural History and ...
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