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Agate alphabet

Agate alphabet

    Gemological data

    • Chemical formula : SiO2
    • Hardness (Mohs) : 6.5/7
    • Density : 2.60
    • Refractive index : 1.53 - 1.54
    • Birefingence : 0.004 - 0.009
    • Crystal system : Rhomboedric - Trigonal
    • Group : Quartz

    The gallery

    It is a variety of agate containing iron oxides. Depending on the size of the cabochons, shapes and letters are highlighted.

    Here is a complete alphabet!

    To learn more about the mineralogy of the agate, see Mindat.ord

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