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  • Turquoise - Wikipedia

    As a secondary mineral, turquoise forms by the action of percolating acidic aqueous solutions during the weathering and oxidation of preexisting minerals. For example, the copper may come from primary copper sulfides such as chalcopyrite or from the secondary carbonates malachite or azurite; the aluminium may derive from feldspar; …

  • UNSPSC Selector Tool - apuc-scot.ac.uk

    A selector tool to be used by suppliers and buying organisations preparing a catalogue for upload into PECOS; Updated on 10th September 2008 for use with Excel 2007.

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