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板岩

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板岩,其结构有变余结构、隐晶质结构,构造为板状构造。基本没有重结晶的岩石,是一种变质岩,原岩为页岩泥岩粉砂岩或中性凝灰岩,沿层理方向可以剥成薄片。板岩的颜色随其所含有的矿物不同而变化,含的为红色或黄色;含质的为黑色或灰色;含质的遇盐酸会起泡。一般以其颜色或成分命名分类,以颜色分类如:绿色板岩、黑色板岩等,以成分分类如:钙质板岩、炭质板岩、凝灰质板岩等。

在板岩含量丰富的地区,板岩经常用来作为屋顶的瓦使用,也可制成书写用的小黑板[1]

附注

  1. ^ R. W. Raymond, Slate, A Glossary of Mining and Metallurgical Terms页面存档备份,存于互联网档案馆), American Institute of Mining Engineers, 1881; page 78.
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板岩
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