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       (YB834-87)Ministry-issude Standards for zircon products
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    (Zr.Hr)O266.0065.0065.0065.0063.0060.0055.00
    TiO20.080.150.501.002.503.508.00
    Fe2O30.060.100.250.300.500.801.50
    P2O3 0.200.250.350.500.801.50
    Al2O3 0.800.800.801.001.201.50
    SiO232.0032.0034.0034.0033.0032.0031.00

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