…Specific gravity: 4.0-4.1. A complex mixture of corundum, magnetite or hematite, spinel, etc. is called emery, and is granular and black or gray-black in color. Corundum occurs in a variety of ways and in many places, including (1) as a component mineral of pegmatite or igneous rocks with low silica content, (2) by recrystallization of alumina-rich sedimentary rocks and bauxite, (3) by metasomatism of igneous rocks and marble, and (4) in hydrothermal alteration zones such as sphagnum deposits. … *Some of the terminology explanations that mention "emery" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…比重4.0~4.1。コランダム,磁鉄鉱あるいは赤鉄鉱,スピネルなどが複雑に混じり合ったものをエメリーemeryといい,粒状,黒色ないし灰黒色である。コランダムの産状は多様で産地も多いが,(1)ペグマタイトあるいはケイ酸分に乏しい火成岩の構成鉱物として,(2)アルミナに富む堆積岩,ボーキサイトなどの再結晶によって,(3)火成岩,大理石などが交代作用を受けて,(4)蠟石鉱床などの熱水変質帯に産出あるいは生成する。… ※「emery」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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