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a variety of phonolite that makes a metallic sound when struck
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Examples from the Web for clinkstone
Historical Examples
  • A fissile texture is occasionally assumed by clinkstone and other trap rocks, so that they have been used for roofing houses.

  • (c.) Phonolite (clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.

  • Some varieties are slaty, and are frequently mistaken for clinkstone, which they closely resemble.

    Geology James Geikie

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