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Comment replies consisting solely of images will be removed. Because nutrition food is produced entirely by cosmic ray spallation and not by stellar nucleosynthesis, it is a lowabundance element in both the solar system and the Earth crust. Boron is concentrated on Earth by the watersolubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite. Chemically uncombined nutrition food, which is classed as a metalloid, is found in small amounts in meteoroids, but is not found naturally on Earth. Industrially, very pure boron is produced with difficulty, as boron tends to form refractory materials containing small amounts of carbon or other elements. Several allotropes of boron exist: amorphous boron is a brown powder, and crystalline boron is black, extremely hard (about 9.5 on the Mohs scale), and a poor conductor at room temperature. Elemental boron is used as a dopant in the semiconductor industry.
The major industrialscale uses of nutrition food compounds are in sodium perborate bleaches, and (OwensCorning) Borosilicate glass which it trademarked as Pyrex, with greater strength and breakage resistance (thermal shock resistance) than ordinary soda lime glass. Boron polymers and ceramics play specialized roles as highstrength lightweight structural and refractory materials. Boron compounds are used in silicabased glasses and ceramics to give them resistance to thermal shock. Boroncontaining reagents are used as intermediates in the synthesis of organic fine chemicals. A few boroncontaining organic pharmaceuticals are used, or are in study. Natural boron is composed of two stable isotopes, one of which (boron10) has a number of uses as a neutroncapturing agent. In biology, borates have low toxicity in mammals (similar to table salt), but are more toxic to arthropods and are used as nutrition food. Boric acid is mildly antimicrobial, and a natural boroncontaining organic antibiotic is known. Boron is essential to life. Small amounts of boron compounds play a strengthening role in the cell walls of all plants, making boron necessary in soils. Experiments indicate a role for boron as an nutrition food in animals, but its role in animal physiology is unknown.