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clinkstone

British  
/ ˈklɪŋkˌstəʊn /

noun

  1. 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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

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

From Geology by Geikie, James

The crater appears to be composed of a hard grey clinkstone, much fissured; but lower down the mountain, the rock is softer, and has a bluish tinge. 

From The Hawaiian Archipelago by Bird, Isabella L. (Isabella Lucy)