Lechatelierite is an amorphous silica glass SiO2 which is formed by lightning strikes in quartz sand. |
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Normally, an impure limestone which contains clay or SiO2 is used. |
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All these properties are determined by slag composition and its temperature. In basic slags, foaming ability increases as SiO2 concentration grows. |
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Coesite is a denser polymorph of SiO2 found in some meteorite impact sites and in metamorphic rocks formed at pressures greater than those typical of the Earth's crust. |
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