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EVT.VN 10 năm trước 1163 lượt xem

    "A"
     

    Gemstone Crystal System Density Hardness Refractive index Treatments
    trigonal 3.06 7.0-7.5 1.624-1.644 none known
    monolinic 3.00 5-6 1.602-1.655 none known
    orthorhombic 4.32-4.68 3.5 1.710-1.768 none known
    microcrystalline 2.66 6.5-7.0 1.544-1.553 dying
    hexagonal 2.55-2.65 5.5-6.0 1.523-1.529 one known
    triclinic 2.96 3.5 1.550-1.641 none known
    orthorhombic 3.72 8.5 1.746-1.755 none known
    allaniteAllanite
    monoclinic 3.40-4.20 6-7 1.640-1.828 none known
    triclinic 2.57-2.77 6.0-7.0 1.527-1.590 none known
    triclinic 2.56 7.0-7.5 1.522-1.530 none known

    amberAmber

    amorphous 1.08 2.0-2.5 1.54 heating, oiling, reconstitution

    citrineAmblygonite

    triclinic 2.9-3.11 5.5-6.0 1.578-1.636 none known

    amethystAmethyst

    hexagonal 2.66 7 1.544-1.553 heating alters to citrine

    ametrineAmetrine

    hexagonal 2.66 7 1.544-1.553 none known

    ammoliteAmmolite

    Aggregate 2.60-2.85 4.5-5.5 1.520-1.680 Opticon, Coating

    andalusiteAnatase

    tetragonal 3.82-3.97 5.5-6.0 2.488-2.564 none known

    gemAndalusite

    orthorhombic 3.2 7.5 1.63-1.64 none known

    andesineAndesine

    triclinic 2.66 6.0-6.5 1.542-1.562 diffused

    apatiteApatite

    hexagonal 3.2 5 1.63-1.64 heat

    apophyliteApophyllite

    tetragonal 2.40 4.5-5.0 1.535-1.537 none known

    aquaAquamarine

    hexagonal 2.72 7.5-8.0 1.577-1.583 heat

    andalusiteAxinite

    Triclinic 3.28 6.5-7.0 1.674-1.706 none known

    azuriteAzurite

    monoclinic 3.7-3.8 3.5-4.0 1.730-1.838 none known