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Vug

A vug, vugh, or vugg 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 are partially filled by quartz, calcite, and other secondary minerals. Open spaces within breccias formed by an ancient collapse are another important source of vugs.

Images
File:Conichalcite-Calcite-65643.jpg|A vug in a limonite matrix is the host for a layer of green botryoids of conichalcite and colorless, translucent rhombs of calcite File:Azurite-Malachite-163967.jpg|Vug with rosettes of deep blue azurite on a field of malachite File:Goosecreekite-Heulandite-Ca-Quartz-indi-41a.jpg|Goosecreekite with heulandite-Ca on quartz File:Rosasite-rosa08a.jpg|Intergrown botryoids of blue-green rosasite inside the curve of a limonite vug File:Epistilbite-indi-15a.jpg|Example of open space in a vug allowing the formation of crystallized minerals File:Pyromorphite-t07-109a.jpg|Apple green pyromorphite cluster on limonite matrix File:Wulfenite-181388.jpg|Vug in a limonitic matrix is the host for bi-pyramidal, brownish-red crystals of wulfenite File:Groutite-tuc1048a.jpg|Crystallized groutite scattered about a hollow vug File:Aurichalcite-Calcite-aur06a.jpg|In a vug of limonite are intergrown clusters of rhombohedral calcite with inclusions of fibrous aurichalcite File:Epistilbite-Fluorapophyllite-Stellerite-indi-20a.jpg|Stellerite, epistilbite, and eluorapophyllite in a basaltic vug File:Sulfur-tmix07-162b.jpg|Nestled in its matrix vug are five golden-yellow crystals of sulfur File:Quartz-Chrysocolla-193915.jpg|In an open pocket in a matrix of limonite there is a cluster of deep robin's-egg blue chrysocolla with a covering of drusy quartz ==See also==
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