This vug in the Cascade Range is partially filled with quartz crystals.
A vug, vugh, or vugg (/vʌɡ/)[1] is a small- to medium-sized[quantify] 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. Open spaces within breccias formed by an ancient collapse are another important source of vugs.[citation needed]
Vugs may also form when mineral crystals or fossils inside a rock matrix are later removed through erosion or dissolution processes, leaving behind irregular voids. The inner surfaces of such vugs are often coated with a crystal druse. Fine crystals are often found in vugs where the open space allows the free development of external crystal form.
The term vug is not applied to veins and fissures that have become completely filled, but may be applied to any small cavities within such veins. Geodes are a vug-formed rock, although that term is usually reserved for more rounded crystal-lined cavities in sedimentary rocks and ancient lavas.[2]
The word vug was introduced to the English language by Cornish miners, from the days when Cornwall was a major supplier of tin.[3] The Cornish word was vooga, which meant "cave".[3]
^"vug". The Free Dictionary. Farlex. Retrieved 17 April 2016.
^Geology Buzz: Vug
^ abThe history of Cornwall, civil, military, religious, ... (Page 56), Richard Polwhele - 1816
A vug, vugh, or vugg (/vʌɡ/) is a small- to medium-sized[quantify] cavity inside rock. It may be formed through a variety of processes. Most commonly...
A geode (/ˈdʒiː.oʊd/; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes...
occurs naturally as the rare mineral lópezite. It has only been reported as vug fillings in the nitrate deposits of the Atacama desert of Chile and in the...
terminology of English, such as costean, gossan, gunnies, kibbal, kieve and vug. The Cornish language and culture influenced the emergence of particular...
of calcite, quartz, dolomite or barite may line small cavities (vugs) in the rock. Vugs are a form of secondary porosity, formed in existing limestone...
the crystallization of liquid magma or perhaps crystallized in a cavity or vug, without steric hindrance, or spatial restrictions, from other crystals....
waters forming the vugs in which the quartz crystals formed. While the dolomite unit is Cambrian in age, the quartz within the vugs is interpreted to have...
opal it is called a thunderegg. The term vug is also used for similar cavities although the meaning of vug is usually restricted to cavities in rocks...
fine-grained with irregular holes (geologists would say they have vesicles and vugs). Much of the soil on the plains came from the breakdown of the local rocks...
limestones of the south coast of the island. These rocks contained cavities or vugs which were later filled with a variety of minerals, including the blue pectolite...
devtalk.nvidia.com POWER9 Webinar presentation by IBM for Power Systems VUG by Jeff Stuecheli on January 26, 2017 Morgan, Timothy Prickett (May 14, 2020)...
Anorthite Anorthite crystals in a basalt vug from Vesuvius (size:6.9 × 4.1 × 3.8 cm) General Category Feldspar Formula (repeating unit) CaAl2Si2O8 IMA...
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