16.6.1.8: Sard

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    Agate
    Chemical composition SiO2 Silicon dioxide
    Crystal system Trigonal
    Habit Aggregate
    Fracture Conchoidal
    Hardness 6.5-7
    Refractive index ± 1.54
    Specific gravity 2.60
    Lustre Vitreous

    This page titled 16.6.1.8: Sard was last modified on Fri, 06 May 2022 23:29:29 GMT and is shared under a CC BY-NC-SA 2.5 license and was authored, remixed, and/or curated by gemology via source content that was edited to the style and standards of the LibreTexts platform.