Mineral assemblage, texture and field occurrence indicate an igneous origin for the charnockites.
矿物组成、结构和野外产状表明：这些紫苏花岗岩是火成成因的。
2
Furthermore the lunar orbiters confirmed that the highlands of the moon are dominated by anorthosite an igneous rock composed primarily of the mineral feldspar and rich in calcium and aluminum.
此外，两艘月球轨道船证实了月球高地主要由斜长岩(一种主要由长石形成的火成岩，富含钙和铝)构成。
3
Its mineral composition shows that it is possibly a new type, of igneous rock.