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" ... So those cool quartz crystals are made of a mineral having a chemical composition of SiO2 and a structure with the oxygen atoms arranged in a tetrahedra around each silica atom. But glass, also made of SiO2, is not a mineral as it has no fixed structure, being just a quenched liquid – remember those wavy 100-plus-year-old glass windows that have flowed under gravity so the glass is thicker at the bottom, very pretty. ... "