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2. Pietra dura - Wikipedia

   en.wikipedia.org/wiki/Pietra_dura

   Altar frontal of Italian opera di commessi, Dubrovnik Cathedral Detail of design with roses over crossed canes, 1882. Pietra dura (Italian: [ˈpjɛːtra ˈduːra]), pietre dure ([ˈpjɛːtre ˈduːre]) or intarsia lapidary [1] (), called parchin kari or parchinkari (Persian: پرچین کاری) in the Indian Subcontinent, is a term for the inlay technique of using cut and fitted, highly ...

3. Pietra serena - Wikipedia

   en.wikipedia.org/wiki/Pietra_serena

   Pietra serena is a blue-gray sandstone used extensively in Renaissance Florence for architectural details. [ 1] It is also known as Macigno stone. [ 2] The material obtained at Fiesole is considered the best and is also quarried at Arezzo, Cortona, and Volterra, [ 2] although it is no longer being actively mined and has been placed under ...

4. Hardstone carving - Wikipedia

   en.wikipedia.org/wiki/Hardstone_carving

   Hardstone carving, in art history and archaeology, is the artistic carving of semi-precious stones (and sometimes gemstones ), such as jade, rock crystal (clear quartz ), agate, onyx, jasper, serpentinite, or carnelian, and for objects made in this way. [ 1][ 2] Normally the objects are small, and the category overlaps with both jewellery and ...

5. Istrian stone - Wikipedia

   en.wikipedia.org/wiki/Istrian_stone

   Istrian stone, pietra d'Istria, the characteristic group of building stones in the architecture of Venice, Istria and Dalmatia, is a dense type of impermeable limestone that was quarried in Istria, nowadays Croatia; between Portorož and Pula. [1][2][3] Limestone is a biogenetic stone composed of calcium carbonate from the tests and shells of ...

6. Category:Quartz varieties - Wikipedia

   en.wikipedia.org/wiki/Category:Quartz_varieties

   Varieties of the mineral Quartz. Subcategories. This category has the following 2 subcategories, out of 2 total. C. Chert‎ (3 C, 23 P) Q. Quartz gemstones‎ (2 C ...

7. Quartz - Wikipedia

   en.wikipedia.org/wiki/Quartz

   Quartz. Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The atoms are linked in a continuous framework of SiO 4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO 2. Quartz is, therefore, classified structurally as a framework silicate mineral ...