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Granites often have large feldspathic phenocrysts. This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale.

斑晶（Phenocryst）とは？火成岩の組織から読み解く地球の記憶

斑晶火成岩斑状組織地質学
2026年8月9日続きを読む →
Granites often have large feldspathic phenocrysts. This granite, from the Swiss side of the Mont Blanc massif, has large white phenocrysts of plagioclase (that have trapezoid shapes when cut through). 1 euro coin (diameter 2.3 cm) for scale.

斑晶（Phenocryst）とは？火成岩の組織から読み解くマグマの履歴

斑晶火成岩斑状組織マグマ
2026年8月9日続きを読む →