from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. phonolite
from the GNU version of the Collaborative International Dictionary of English
- n. An igneous rock of feldspathic composition, lamellar in structure, and clinking under the hammer. See phonolite.
from The Century Dictionary and Cyclopedia
- n. Same as phonolite.
clink + stone, from the metallic sound when it is hit. (Wiktionary)
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.