斯石英
- 网络Stishovite;Stishorite
斯石英-
自由SiO2系指石英及其同质多型物（polymorphs）柯石英、斯石英等。
Free SiO-2 is represented by quartz , coesite and stishovite polymorphs .
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根据高温高压相平衡实验资料，橄榄石、辉石这样的硅酸盐矿物在地幔深部的压力条件下可以分解成简单氧化物，如FeO（方铁矿）、MgO（方镁石）以及SiO2（斯石英）等。
High-pressure and high-temperature phase equilibrium experiments show that silicates such as olivine and pyroxene will be decomposed into simple oxides like FeO ( wustite ), MgO ( periclase ) and SiO-2 ( stishovite ) beneath the lower mantle ( 670 km ) .
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石英广泛分布于地壳中的各种岩石中，柯石英和斯石英只存在于超高压岩石和陨石坑中。
Quartz widely occurs in different rocks of the earth 's crust , whereas coesite and stishovite are only formed under high pressures and temperatures .