Crystal 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 (folding and faulting) are partially filled by quartz, calcite, and other secondary minerals.

Colors They Come In - Most commonly the color of the base rock is.

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Fracture - Conchoidal to Uneven

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Classic Characteristic - Sparkly

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Texture - Crystals are Vitreous (glass-like) and feel like bumpy glass.

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Streak - White

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Locality - Around water, particularly flowing water.

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Where They Can Be Found - They are found in all forms of rock: Igneous, Metamorphic and Sedimentary.

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Hardness On The Mohs Scale - 7 Out Of 10.