Vug meaning

vŭg, vo͝og
A small cavity in a rock or vein, often with a mineral lining of different composition from that of the surrounding rock.
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A cavity or hollow in a rock or lode, often lined with crystals.
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A small to medium-sized cavity inside rock that may be formed through a variety of processes.
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Origin of vug

From Cornish vooga (“cave"); compare fogou.