This next sample that I 'll pass around is a microcline mineral , also called amazon stone .

我要传的下一个标本是斜长石，也被称为亚马逊石。

Here are a few guidelines for using oxalic acid to remove iron stains from minerals like smoky quartz and microcline .

这里有一些指引，用草酸除铁污渍从矿物像黑烟石英和钾长石。