clinkstone

noun

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

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.
A Manual of Elementary Geology
Charles Lyell.
(c.) Phonolite (Clinkstone) is a trachytic rock, composed essentially of sanidine, nepheline, and augite or hornblende.
Volcanoes: Past and Present
Edward Hull
Some varieties are slaty, and are frequently mistaken for clinkstone, which they closely resemble.
Geology
James Geikie

clinkstone

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.