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A high-density form of crystalline silica (see also quartz) with the same formula SiO2, but formed at pressures greater than 10 GPa; discovered at some meteorite impact sites, but rarely in terrestrial rocks; sp.gr. 4.3; minerals possessing a similar atomic lattice may exist in the Earth's upper mantle.

Subjects: Earth Sciences and Geography — Astronomy and Astrophysics.

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