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  2. 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 ...

  3. Desert rose (crystal) - Wikipedia

    en.wikipedia.org/wiki/Desert_rose_(crystal)

    A desert rose is an intricate rose-like formation of crystal clusters of gypsum or baryte, which include abundant sand grains. [1] The "petals" are crystals flattened on the c axis , fanning open in radiating clusters.

  4. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Rose quartz (var.) Rock crystal (var.) Shocked quartz (var.) Smoky quartz (var.) Quartzite; R–Z ... Rocks. Some rocks are used as gems, including: Anthracite; Anyolite;

  5. Rhodochrosite - Wikipedia

    en.wikipedia.org/wiki/Rhodochrosite

    Rhodochrosite with fluorite, tetrahedrite and quartz. Rhodochrosite from Silverton, Colorado , U.S. The Alma King is the largest known rhodochrosite crystal; it was found in the Sweet Home Mine near Alma, Colorado and donated to the Denver Museum of Nature and Science .

  6. Rhodonite - Wikipedia

    en.wikipedia.org/wiki/Rhodonite

    Rhodonite is a manganese inosilicate, with the formula (Mn, Fe, Mg, Ca)SiO 3, and member of the pyroxenoid group of minerals, crystallizing in the triclinic system. It commonly occurs as cleavable to compact masses with a rose-red color (its name comes from Ancient Greek ῥόδον (rhódon) 'rose'), often tending to brown due to surface oxidation.

  7. Metal-coated crystal - Wikipedia

    en.wikipedia.org/wiki/Metal-coated_crystal

    Quartz is heated to 871 °C in vacuum, and golden wire is heated to even higher temperature, either by resistive heating with direct electrical current, or by magnetron. [1] Gold sublimation (phase transition) occurs, the resulting vapor depositing onto the crystal's surface.

  8. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    Types of synthetic quartz include citrine, rose quartz, and amethyst. Natural occurring quartz is not rare, but is nevertheless synthetically produced as it has practical application outside of aesthetic purposes. Quartz generates an electric current when under pressure and is used in watches, clocks, and oscillators. [62]

  9. Pegmatite - Wikipedia

    en.wikipedia.org/wiki/Pegmatite

    Rose muscovite from the Harding pegmatite mine Blue apatite crystals at the Harding pegmatite mine. Pegmatites form under conditions in which the rate of new crystal nucleation is much slower than the rate of crystal growth. Large crystals are favored. In normal igneous rocks, coarse texture is a result of slow cooling deep underground. [14]

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