where is the element boron found in nature
Boron is a chemical element with symbol B and atomic number 5 . Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis , it is a low - abundance element in the Solar system and in the Earth 's crust . Boron is concentrated on Earth by the water - solubility of its more common naturally occurring compounds , the borate minerals . These are mined industrially as evaporites , such as borax and kernite . The largest known boron deposits are in Turkey , the largest producer of boron minerals .