煌斑岩為一種淺成岩,通常顏色較深,含有由暗色礦物組成的斑晶,在肉眼觀察時,其標本閃閃發光,因此而得名。其組成成分多為長石和與斑晶相同的暗色礦物,尤其是雲母。按其成分可分為:

  • 雲母煌斑岩,最為常見,黑色或灰黑色,風化後轉為褐黃色,斑晶主要是黑雲母;
  • 閃輝煌斑岩,黑色、黑綠色或綠色,斑晶主要是角閃石和透輝石,有時有橄欖石和黑雲母;
  • 鹼性煌斑岩,礦物成分複雜,質含量低,斑晶主要是鹼性輝石或鹼性角閃石;

外部連結

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