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Daleti marble, Western Welega: white, white with grey veins and other colours [1] Enda Tikurir marble, Western Tigray. Newi marble, Central Tigray. Akmara marble, Central Tigray. Dichinamo marble, Western Tigray.
Marble is a metamorphic rock consisting of carbonate minerals (most commonly calcite (CaCO 3) or dolomite (CaMg (CO 3) 2) that have recrystallized under the influence of heat and pressure. [ 1 ] It has a crystalline texture, and is typically not foliated (layered), although there are exceptions. In geology, the term marble refers to ...
Chalcedony. Chalcedony (/ kælˈsɛdəni / kal-SED-ə-nee, or / ˈkælsəˌdoʊni / KAL-sə-doh-nee) [2] is a cryptocrystalline form of silica, composed of very fine intergrowths of quartz and moganite. [3] These are both silica minerals, but they differ in that quartz has a trigonal crystal structure, while moganite is monoclinic.
Carrara marble, or Luna marble (marmor lunense) to the Romans, is a type of white or blue-grey marble popular for use in sculpture and building decor. It has been quarried since Roman times in the mountains just outside the city of Carrara in the province of Massa and Carrara in the Lunigiana , the northernmost tip of modern-day Tuscany , Italy.
Nero Marquina. Nero Marquina marble (mármol negro Marquina [1]) is a high quality, black bituminous limestone extracted from the region of Markina, Basque Country in the North of Spain. [2] This variety of marble gets its black color from naturally-occurring bitumen. [3] It is one of the most important marbles from Spain.
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 and ...