The Plagioclase feldspars formula NaxCa(1-x)Al(2-x)Si(2+x)O8 does not correspond directly to the text Oligoclase 10-30% An and so on. I suggest Na(1-x)CaxAl(1+x)Si(3-x)O8. Any other opinion? --Stenallan (留言) 09:45, 28 November 2019 (UTC)[回覆]
