…When a rock is made up of two groups of minerals with clearly different sizes, such as phenocrysts and matrix minerals, it is called a porphyritic texture. In contrast, the texture of volcanic rocks that contain almost no phenocrysts is called aphyric. When an igneous rock is made up of mineral grains of roughly the same size, it is called equigranular. … *Some of the terminology explanations that mention "affiliate" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…斑晶と石基鉱物のように,はっきり大きさの異なる2群の鉱物でできているとき斑状組織という。これに対し斑晶をほとんど含まない火山岩の組織をアフィリックaphyric(無斑晶状)という。火成岩がほぼ同じ大きさの鉱物粒からできているときは等粒状equigranularという。… ※「アフィリック」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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