长石是一种分佈最广泛的普通造岩矿物。它在火成岩中所佔的地位非常重要:它是火成岩分类命名的重要根据之一;同时研究火成岩的岩性对比及其成因规律也离不开长石。因此,对火成岩中长石的种类锰定是一件相当重要的事情。兹将有关问题提出来和同 Feldspar is the most widely distributed common rock-forming mineral. Its place in igneous rocks is very important: it is one of the important bases for the classification of igneous rocks. It is also inseparable from feldspar in studying the lithology contrast and its origin law of igneous rocks. Therefore, the type of igneous rock in igneous manganese is a very important thing. I hereby put forward the same issues