Majorite
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...The results of these high-pressure experiments suggest that pyrope and pyrope-rich garnet-structured solid solutions are widely present as major minerals in the mantle at depths of 60-80km to 700km, along with olivine and its high-pressure phase, modified spinel, spinel, and pyroxene. Garnet, which has a chemical composition similar to that of pyroxene, has been found in meteorites and has been given the mineral name majorite Mg 3 (Fe,Al,Si) 2 Si 3 O 12. It is used as an abrasive, and its beautiful transparent crystals are used as gemstones. ... *Some of the terminology explanations that mention "majorite" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
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…これらの高圧実験の結果から，パイロープやパイロープ成分に富むザクロ石構造固溶体はカンラン石やその高圧相である変形スピネル，スピネルや輝石とともに地下60～80kmから700kmまでの深さのマントルの主要鉱物として広く存在していると考えられている。この輝石に近い化学組成のザクロ石は隕石に発見され，メージャライトmajorite Mg3(Fe,Al,Si)2Si3O12という鉱物名が与えられている。 研磨材として，また透明の美しい結晶は宝石として用いられる。… ※「majorite」について言及している用語解説の一部を掲載しています。 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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