vuggy definition
This vug in the Cascade Range is partially filled with quartz crystals. A vug, vugh, or vugg (pronunciation: /vÊÉ¡/) is a small to medium-sized cavity inside rock. It may be formed through a variety of processes. Most commonly, cracks and fissures opened by tectonic activity (folding and faulting) are partially filled by quartz, calcite, and other secondary minerals.