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16.4.9: Morganita

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    Morganita
    Composición química Be 3 Al 2 (SiO 3) 6 Silicato de berilio y aluminio
    Sistema de cristal Hexagonal
    Hábito Prismático
    Escote Pobre, basal
    Fractura Concoidal a desigual
    Dureza 7.5
    Naturaleza óptica Unixaial -
    Índice de refracción 1.58 - 1.60
    Birrefringencia 0.008 - 0.009
    Dispersión Bajo, 0.014
    Gravedad específica 2.80 - 2.90
    Lustre Vítreo
    Pleocroísmo Débil a moderado (tonos de color corporal)

    Archivo:Morganite minas gerais.jpg

    Figura\(\PageIndex{1}\): Minas Gerais, Brasil


    La morganita es la variedad rosa, melocotón o lila del berilo mineral. Es un silicato de berilio y aluminio coloreado con una cantidad traza de manganeso. La piedra lleva el nombre del banquero estadounidense y amante de las gemas, J. P. Morgan, poco después de que se descubriera por primera vez en 1902 en la República Malgache (Madagascar). En la actualidad se encuentran buenos ejemplos en Minas Gerais, Brasil y Madagascar.

    Figura\(\PageIndex{2}\): Minas Gerais
    Brasil

    Archivo:Morganite.jpg

    Figura\(\PageIndex{3}\): Brasil

    Los berilos rojos (bixbitas) y rosados (morganita) se fabrican utilizando el proceso hidrotermal de Biron International en Australia. El agente colorante en estos sintéticos es el titanio opuesto al manganeso en sus contrapartes naturales.


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