Mimetite group minerals are a group of isomorphic series minerals with hexagonal system,which include mimetite,vanadinite and pyromorphite.
砷铅是一六方的类质同,包括砷铅、钒铅和磷氯铅。
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Not all non-cubic gems are pleochroic, and even when they are, the color change isn't always noticeable to our eyes.
并不是所有轴晶系的宝石都有多色性,并且即有这一性质,颜色的改变也不一定可见。
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