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Need synonyms for shale? Here's a list of similar words from our thesaurus that you can use instead.
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 Sedimentary rock, composed mainly of clay 
      “Carbonaceous shale, including oil shale, occurs in beds of clayey to silty mudrock from 0.3 to 3 m thick.” 
  
Rock formed from sediment 
A loose aggregation of small water-worn or pounded stones 
To remove the (natural) skin or outer covering of 
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