Chemical name: Silicon Dioxide (silica)

CAS number: 14808-60-7

Silicon dioxide, also known as silica, is an oxide of silicon with the chemical formula SiO₂, commonly found in nature as quartz. In many parts of the world, silica is the major constituent of sand.

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Sources:

https://en.wikipedia.org/wiki/Silicon_dioxide

https://www.fellow.dog/ingredient/silicon-dioxide

https://www.canr.msu.edu/news/silicon-dioxide

https://www.ewg.org/skindeep/ingredients/725992-SILICON_DIOXIDE_COLLOIDAL/