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2020-11-19 · (mineralogy) Any of a large group of rock-forming minerals that, together, make up about 60% of the earth''s outer crust. The feldspars are all aluminum silicates of the alkali metals sodium, potassium, calcium and barium. Feldspars are the principal constituents of igneous and plutonic rocks
This volume, released in 2014, is the ''Centenary Edition'' because the World Mineral Statistics dataset that underpins this publication is continuous from 1913 to the present day, containing mineral production data by commodity, by country, in each of those years.The dataset also contains import and export data for a large number of the commodities for the majority of the last century.