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Onix
- Onyx Mineralogically is a variety of chalcedony, or quartz in microcrystalline compact masses, of opaque or semi-opaque color, uniform, covering the red-brown tones and the whole range of grays up to black.
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Travertine
- Travertine is a calcareous sedimentary rock of chemical type, widely used in construction, in particular in Rome, since the first millennium a.C..
