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  1. Amethyst is pleochroic (Haidinger, 1847; Pancharatnam, 1954; Raman, 1954): when the polarization of the light is changed from parallel to the c-axis to perpendicular to the c-axis, amethyst changes its color from blue-violet to purple.

  2. Nov 08, 2021 · Convegno. Ascolta l'audio registrato lunedì 8 novembre 2021 presso Roma. Organizzato da Fondazione Bettino Craxi

  3. METODOLOGÍA DE LA INVESTIGACIÓN: LAS RUTAS CUANTITATIVA, CUALITATIVA Y MIXTA

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