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onyx marble mining procedure

onyx marble mining procedure

Onyxis a form of chalcedony, part of the quartz group. Like the other stones in the chalcedony family,onyxhas a smooth, waxy luster.Onyxcan be found in a wide range of colors, often layered. Specific Gravity ofonyxis 2.58 - 2.64, Refractive Index of the stone is 1.55 - 1.54, Hardness ofonyxis 6.5 - …

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