Template:Unreferenced stub


Pitchstone is a dull black glassy volcanic rock formed when viscous lava or magma cools quickly. It is similar to but coarser than obsidian. It is a volcanic glass with a conchoidal fracture (like glass), a resinous lustre, and a variable composition. Its colour may be mottled, streaked, or uniform brown, red, green, gray, or black. It is an extrusive rock that is very resistant to erosion.

The pitchstone ridge of An Sgùrr on the Isle of Eigg, Scotland, was originally formed as a lava flow in a valley.Template:Volcanology-stub Template:Glass-material-stub

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.