Chalcedony rough is a cryptocrystalline form of silica and generally has a waxy lustre. It may be semitransparent or translucent and can obtain good polish when cut and worked.
Its colour is usually white to grey, greyish-blue, or a shade of brown ranging from pale to nearly black.
It is a highly sought-after precious gem which for centuries has been used in the creation and encrustation of jewelry and everyday items.
Its chemical composition is Si02.
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