A simulated visual representation of the structural transition from coesite to post-stishovite. The silicon atoms (blue spheres) surrounded by four oxygen atoms (red spheres) are shown as blue ...

For example, coesite—a particularly dense type of quartz—forms at pressures between about 26,000 atmospheres and 69,000 atm. So, its presence doesn’t indicate the specific pressure that ...

The discovery of coesite, a high-pressure polymorph of quartz, which is tiny but indicator mineral of ultrahigh-pressure (UHP) metamorphism, from the continental crust rocks in the 1980s ...

Examining how plates move in Earth's mantle and how mountains form is no easy feat. Certain rocks that have sunk deep into Earth's interior and then returned from there can deliver answers.

Globally, only 24 occurrences of coesite have been unearthed thus far, including the two discoveries in Ceará — the first in Brazil — as reported in the June edition of Lithos. “We will no doubt find ...

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