Ice VII is a high-pressure phase of ice, which means it forms under extreme pressure conditions. It is a crystalline form of ice that has a different structure than the more common ice forms, such as ice I or ice II.
Ice VII is formed at pressures above 2 gigapascals (GPa) and temperatures below 130 degrees Celsius. It has a density of about 1.65 grams per cubic centimeter, which is higher than the density of other ice forms. It is also transparent and has a cubic crystal structure.
Ice VII is not naturally found on Earth's surface, as the pressure conditions required for its formation are not typically present. However, it can be created in laboratories using high-pressure devices, such as diamond anvil cells.
The study of ice VII is important in understanding the behavior of water under extreme conditions, such as in the deep interiors of icy moons or planets. It can also provide insights into the properties of other materials under high-pressure conditions.
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