出典:Wiktionary
出典:Wikipedia
出典:『Wikipedia』 (2011/06/03 12:52 UTC 版)
Gregoryite is an anhydrous carbonate that is rich in potasium and sodium (examples of geochemical composition: [(Na2,K2,Ca)CO3], [Na0.78K0.05][Ca0.17CO3]). It is one of the two main ingredients of natrocarbonatite, found naturally in the lava of Ol Doinyo Lengai volcano, the other being nyerereite.