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16.56: Prehnita

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    Prehnita
    Composición química Ca 2 Al 2 Si 3 O 10 (OH) 2 +Fe
    Sistema de cristal Ortorrómbico
    Hábito Generalmente agregado fibroso
    Escote Buena dirección: 1
    Fractura Uneven-Concoidal
    Dureza 6-6.5
    Naturaleza óptica Agregado biaxial (+)
    Índice de refracción 1.649-1.616
    Birrefringencia .020-0.031
    Gravedad específica 2.90
    Lustre Vítreo-nacarado  

    Archivo:Prehnite2.jpg

    Figura\(\PageIndex{1}\): Cabujón Prehnite
    Foto cortesía de Barbra Voltaire

    Archivo:Prehnite1.jpg

    Figura\(\PageIndex{2}\): Cristales de Prehnita
    Foto cortesía de Barbra Voltaire

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