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Title: pitchstone
Caption: Pitchstone is a volcanic (extrusive) igneous rock formed by the rapid cooling of rhyolitic lavas, and has a resinous or pitchy appearance. It has a glassy, aphanitic texture.
Category: nature • Geology & Fossils
Credit: Album / Science Source / Mark A. Schneider
Image size: 4256 × 2848 px | 34.7 MB
Print size: 36.0 × 24.1 cm | 1675.6 × 1121.3 in (300 dpi)