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east of Laguna de Jaco
formed through high-grade metamorphic processes within ancient continental crust
Mined from: Paprok Mine
This mineral is not only a favorite among collectors and lapidaries but also has industrial significance as a minor manganese ore
Corrundum (Placer) - Mineral vesta east of Laguna de JacoMined from: Alder, Montana Description: This natural corundum placer specimen comes from the historic gem bearing gravels of Alder, Montanaan area long celebrated for its sapphires and other alluvial treasures. These water worn corundum fragments were naturally tumbled by ancient stream systems, giving them a slight rounded appearance that reflects their journey through time. Composed of aluminum oxide, corundum ranks 9 on the Mohs hardness scale,
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