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  2. Gemstones in the Bible - Wikipedia

    en.wikipedia.org/wiki/Gemstones_in_the_Bible

    Crystal quartz is a transparent crystalline variety of the mineral quartz, resembling glass. Job lists gavish (crystal quartz) alongside gold, onyx, lapis lazuli, glass, coral, and peridot as a valuable trade good. The Hebrew word gavish is a wanderwort, which probably originated in historical Nubia, modern Sudan.

  3. Tuff - Wikipedia

    en.wikipedia.org/wiki/Tuff

    In weathering, they often change to soft red or yellow claystones, rich in kaolin with secondary quartz. [9] Recent trachyte tuffs are found on the Rhine (at Siebengebirge), [35] in Ischia [36] and near Naples. [37] Trachyte-carbonatite tuffs have been identified in the East African Rift. [38] Alkaline crystal tuffs have been reported from Rio ...

  4. Sebago Granite - Wikipedia

    en.wikipedia.org/wiki/Sebago_Granite

    This Sebago Granite is a 2-mica granite, and is mainly composed of potassium feldspar, quartz, biotite, and muscovite. Its composition is homogeneous in nature with fine to medium grain sizes. [ 2 ] [ 5 ] The proportions of biotite and muscovite vary throughout the unit, and garnet is common in some locations. [ 3 ]

  5. Quartz - Wikipedia

    en.wikipedia.org/wiki/Quartz

    Quartz is, therefore, classified structurally as a framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. [10] Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation ...

  6. Porcelain - Wikipedia

    en.wikipedia.org/wiki/Porcelain

    Doccia porcelain of Florence was founded in 1735 and remains in production, unlike Capodimonte porcelain which was moved from Naples to Madrid by its royal owner, after producing from 1743 to 1759. After a gap of 15 years Naples porcelain was produced from 1771 to 1806, specializing in Neoclassical styles. All these were very successful, with ...

  7. Geology of Italy - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Italy

    Quartz, salt, feldspar, asbestos, talc, magnesite, graphite, leucite, bentonite and perlite are all extracted for industrial purposes. Historically, Italy had silver-zinc-lead mines in Monte Neve, Raibl (in the Eastern Alps), and Sardinia, mercury in north Amiata, Tuscany, fluorite and antimony in Sardinia and pyrite in Tuscany.

  8. Quartieri Spagnoli - Wikipedia

    en.wikipedia.org/wiki/Quartieri_Spagnoli

    One of a network of busy, narrow streets that comprise the majority of thoroughfares traversing the historic Spanish Quarter of Naples. Quartieri Spagnoli in Naples. The eastern boundary is the Via Toledo, the main shopping street of Naples. This pedestrianized area is very popular at night with locals meeting family and friends. [2]

  9. Chalcedony - Wikipedia

    en.wikipedia.org/wiki/Chalcedony

    Chalcedony (/ k æ l ˈ s ɛ d ə n i / kal-SED-ə-nee or / ˈ k æ l s ə ˌ d oʊ n i / 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.

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