| 21. | It sometimes includes Chert and Argillite.
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| 22. | In its natural state, argillite is often a grey-black or green-black color.
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| 23. | Rocks on North West Solitary Island consist of repeating beds of sillicaceous argillite, mudstone and sandstone.
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| 24. | Despite this, Haida argillite carving has only been studied systematically during the last thirty to forty years.
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| 25. | Another method of sealing in moisture is to cover the surface of the uncarved argillite piece with Varathane.
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| 26. | Commercial argillite carving seems to have begun during the 1820s when it became valued as a trade item.
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| 27. | Inuit artists sculpt with walrus ivory, caribou antlers, bones, soapstone, serpentinite, and argillite.
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| 28. | The mineralized wall rock mostly, but not exclusively, consists of shale-argillite ( slate ).
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| 29. | The lithology of the Rocky Mountains in western Canada includes a carbonates, shales, argillites and sandstones.
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| 30. | Business grew, and in 1818, Deering, along with David and John Trimble, built Argillite Furnace.
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