| − | Only about 0.001% of Earth's crust consists of boron. The two main producers of commercial boron are the USA and Turkey, with Turkey having about 72% of teh known commercially viable deposits. Due to its reactivity boron is not found in elemental form, but is commercially extracted from a number of compounds including borax and boric acid. | + | Only about 0.001% of Earth's crust consists of boron. The two main producers of commercial boron are the USA and Turkey, with Turkey having about 72% of the known commercially viable deposits. Due to its reactivity boron is not found in elemental form, but is commercially extracted from a number of compounds including borax and boric acid. |