• Kyanite - gemstone hardness

    Kyanite – Natural, Specimen, Blue

    Gemstone hardness may vary a bit within a species. However, kyanite is unusual in that its hardness may vary tremendously, from 4 to 7.5, within a single crystal. Faceters rarely cut this stone. Kyanite and quartz, Barra de Salinas, Coronel Murta, Jequitinhonha Valley, Minas Gerais, Brazil. Photo by Géry Parent. Licensed under CC By-ND 2.0

    Article: Gemstone Hardness and Wearability

    Credit: Géry Parent

    GemstoneKyanite
    Natural or man madeNatural
    OriginBrazil
    Origin detailsBarra de Salinas, Coronel Murta, Jequitinhonha Valley, Minas Gerais
    Gem StateSpecimen
    ColorBlue
    TransparencyOpaque