... 硷性岩类 alkali rocks; alkaline rocks 粒状岩类 grained rocks 沥青岩类 kerite ...
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Shales are fine-grained sedimentary rocks that can be rich sources of petroleum and natural gas.
FORBES: China Closer To Joining Shale Gas Fracking Craze
The rocks contain very fine-grained sediments but are cut through with pale veins of what could be calcium sulphate.
BBC: Curiosity Mars rover takes historic drill sample
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