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Veins formed in this way may exhibit a colloform, agate-like habit, of sequential selvages of minerals which radiate out from nucleation points on the vein walls and appear to fill up the available open space. Often evidence of fluid boiling is present. Vugs, cavities and geodes are all examples of open-space filling phenomena in hydrothermal ...
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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]
A geode (/ ˈ dʒ iː. oʊ d /; from Ancient Greek γεώδης (geṓdēs) 'earthlike') is a geological secondary formation within sedimentary and volcanic rocks. Geodes are hollow, vaguely spherical rocks, in which masses of mineral matter (which may include crystals) are secluded.
#19 Crack Open The Fun On Thanksgiving With The National Geographic Break ... "Got this for my 7 and 14 year old and they had so much fun busting them open and seeing the beautiful geodes inside ...
This could crack the interior at depths as shallow as 10 meters (33 ft). [49] A more speculative theory is that the septaria form by brittle fracturing resulting from earthquakes . [ 50 ] Regardless of the mechanism of crack formation, the septaria, like the concretion itself, likely form at a relatively shallow depth of burial of less than 50 ...
They think of the idea of cracking open a six-pack before they go to bed,” said Uriel Daluz, 26, who was one of the few sipping a cocktail at the Sunset Park gaming club.
As these cracks open up, the stresses at the crack tips intensify, eventually exceeding the rock strength and allowing the fracture to propagate. This can occur at times of rapid overburden erosion. Folding also can provide tension, such as along the top of an anticlinal fold axis.