पिचस्टोन (pitchstone) एक आग्नेय शैल है जो काले रंग की कांच जैसी होती है। यह ज्वालामुखी से निकले मैग्मा के तेजी से ठण्डा होने से बनती है।

Pitchstone is a dark coloured, glassy volcanic rock formed when felsic lava or magma cools quickly. Since it is a volcanic glass, pitchstone may have a conchoidal fracture. Pitchstones may also contain phenocrysts, in which case it is a form of vitrophyre. Pitchstone has a resinous lustre, or silky in some cases, 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.