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    18x13mm

    Prehnite 18x13mm Oval - 15-16 Inch

    $17.00

    Prehnite was the first mineral to be named after a person: its discoverer, Dutch Colonel Hendrik Von Prehn. Von Prehn discovered the stone in South Africa in 1774. Prehnite is...

    Psilomelane 18x13mm Oval Cabochon

    $28.00

    Psilomelane describes a group of hard black manganese oxides, including Hollandite and Romanechite. Psilomelane consists of hydrous manganese oxide with variable amounts of barium and potassium. Psilomelane is erroneously, and...

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