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2. Mineral resources
Boron abundance is of the order of 3 ppm (or g/t) in the earth's crust, 10 ppm in continental crust and 4.5 mg/L in seawater . The main resources are borate ores and brines.
2.1 Minerals
Borate ores are made up of the mineral species listed in Table 1 , but there are over 230 boron-bearing mineral species
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Mineral resources
Ore processing and production of refined borax and boric acid
Bibliography
Websites
Industrial Minerals http://www.indmin.com
World Metals and Minerals Review. British geological Survey http://www.bgs.ac.uk
United States Geological Survey http://www.usgs.gov
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