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  2. Carrara marble - Wikipedia

    en.wikipedia.org/wiki/Carrara_marble

    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.

  3. List of types of marble - Wikipedia

    en.wikipedia.org/wiki/List_of_types_of_marble

    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.

  4. Unakite - Wikipedia

    en.wikipedia.org/wiki/Unakite

    Unakite can be found as pebbles and cobbles from glacial drift all across the US Midwest. It also occurs in Virginia where it is found in the river valleys after having been washed down from the Blue Ridge Mountains. First found in the United States, unakite has a worldwide distribution, having also been reported in South Africa, Sierra Leone ...

  5. Quartz - Wikipedia

    en.wikipedia.org/wiki/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 and ...

  6. Rolex Oysterquartz - Wikipedia

    en.wikipedia.org/wiki/Rolex_Oysterquartz

    Rolex Datejust Oysterquartz Ref. 17014. The Rolex Oysterquartz was a quartz watch made by Rolex. Unlike most watches, The Rolex Oysterquartz features a mechanical lever escapement driven by a simple permanent magnet moving coil motor mechanically similar to a d'Arsonval galvanometer.

  7. List of mining areas in Colombia - Wikipedia

    en.wikipedia.org/wiki/List_of_mining_areas_in...

    This is a list of mining areas in Colombia. [1] The mineral industry of Colombia is large and diverse; the country occupies the first place in mining areas per surface area in the world.

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  9. Shocked quartz - Wikipedia

    en.wikipedia.org/wiki/Shocked_quartz

    Shocked quartz is a form of quartz that has a microscopic structure that is different from normal quartz. Under intense pressure (but limited temperature), the crystalline structure of quartz is deformed along planes inside the crystal. These planes, which show up as lines under a microscope, are called planar deformation features (PDFs), or ...

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