上面所说的钠是指氧化钠(Na2O-2)大于氧化钾(K2O);钾是指氧化钠小于氧化钾。但已有其它的名称来命名特别富含钠或钾的岩石(如超钾火成岩)。 AlbertJohannsen, A Descriptive Petrography of the Igneous Rocks. Volume 1, Introduction
federated self-government entrusted to us.) Weinberg, p. 145; Johannsen p. 9. Johannsen, p. 10. "Prospectus of the New Series", The American Whig Review