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Pitchstone
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The American Heritage® Dictionary of the English Language, 4th Edition
n.
Any of various volcanic glasses distinguished by their dull pitchlike luster.
Wiktionary, Creative Commons Attribution/Share-Alike License
n.
a natural glass, that is rich in microscopic crystallites, formed by the rapid cooling of lava or magma
the GNU version of the Collaborative International Dictionary of English
n.
An igneous rock of semiglassy nature, having a luster like pitch.
The Century Dictionary and Cyclopedia
n.
An old volcanic rock, resembling hardened pitch in appearance.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n.
dark acid granitic glass
Word Usage
"Most of our ground sits beneath the shadow of An Sgurr, a 1,289ft solidified lump of pitchstone lava."
Hypernym
Words that are more generic or abstract
volcanic glass