The feldspars are by far the most abundant group of minerals and are found in igneous, metamorphic and many sedimentary rocks. Felsdpars are framework silicates where each silica tetrahedra share all corners with its four neighbouring tetrahedra. World feldspar consumption totalled 13.9 million tonnes and is growing on average 2% per annum. Turkey is the leading exporter, accounting for 33% of all exports by quantity, while Italy and the USA remain the leading importers. In Asia production of feldspar is worth over US$180 million.
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