Geografía e Historia
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Linarita, cristais de 0.68mm de comprimento. Minas Monte Trisa, Mercanti Valley, Torrebelvicino, Província de Vicenza, Veneto, Itália.
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Chert es una roca microcristalina o criptocristalina sedimentaria, compuesta de dióxido de silicio (SiO2). Se produce en forma de nódulos y masas de concreciones. Se rompe con fractura concoidea, muy a menudo produciendo bordes afilados. En la prehistoria...
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