High-pressure minerals

Japanese: 高圧鉱物 - こうあつこうぶつ（英語表記）high‐pressure mineral

A mineral that formed under high-pressure environments or is stable only under high pressure. Diamond is a typical example of a high-pressure mineral. Using high-pressure minerals as clues, we can infer the pressure environment in which the rocks that contain them formed. The rocks that we can observe on the Earth's surface are classified into igneous rocks, sedimentary rocks, and metamorphic rocks based on the process by which they were formed, but some metamorphic rocks were formed when existing rocks were subjected to high temperatures and high pressures deep in the Earth's crust, changing their mineral composition. High-pressure minerals in the rocks that make up the Earth's crust are found in the metamorphic rocks that were formed in this way.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

高圧環境のもとで生成した鉱物，あるいは高圧下でのみ安定な鉱物。ダイヤモンドは典型的な高圧鉱物である。高圧鉱物を手がかりに，それを含んだ岩石を生成した圧力環境を推定することができる。われわれが観察できる地球表層の岩石は，その生成過程により，火成岩，堆積岩，変成岩に分類されるが，変成岩の中には，既存の岩石が地殻深所で高温高圧の作用を受けて鉱物組成を変えて生じたものがある。地殻を構成する岩石中の高圧鉱物は，そのようにして生成した変成岩に見られる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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