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  2. List of gemstones by species - Wikipedia

    en.wikipedia.org/wiki/List_of_gemstones_by_species

    Actinolite. Nephrite (var.); Adamite; Aegirine; Afghanite; Agrellite; Algodonite; Alunite; Amblygonite; Analcime; Anatase; Andalusite. Chiastolite; Andesine ...

  3. 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]

  4. Morganite (gem) - Wikipedia

    en.wikipedia.org/wiki/Morganite_(gem)

    Following the discovery of a new locality for rose beryl in Madagascar in 1910, George Kunz proposed the name morganite at a meeting of the New York Academy of Sciences on 5 December 1910 to honour his friend and customer J.P. Morgan [6] [7] for his financial support for the arts and sciences, and his important gifts of gems to the American Museum of Natural History in New York and to the ...

  5. Marcasite jewellery - Wikipedia

    en.wikipedia.org/wiki/Marcasite_jewellery

    Marcasite jewellery is jewellery made using cut and polished pieces of pyrite (fool's gold) as gemstone, and not, as the name suggests, from marcasite. [1] Both pyrite and marcasite are chemically iron sulfide, but differ in their crystal structures, giving them different physical properties. Pyrite is more stable and less brittle than marcasite.

  6. 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 ...

  7. IWC Schaffhausen - Wikipedia

    en.wikipedia.org/wiki/IWC_Schaffhausen

    A rise in gold prices in 1974 had grave consequences for the watch exporting industry. Between 1970 and 1974 the price of gold rose from 4,850 to 18,000 francs and the value of the US dollar against the Swiss currency fell by up to 40%. As a result, the price of watch exports rose by as much as 250%.