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The terms lava stone and lava rock are more used by marketers than geologists, who would likely say "volcanic rock" (because lava is a molten liquid and rock is solid). "Lava stone" may describe anything from a friable silicic pumice to solid mafic flow basalt, and is sometimes used to describe rocks that were never lava, but look as if they ...
The area of the rust-coloured rock formations is known as Pariwhero, meaning red rocks. [4] Pariwhero / Red Rocks has an official dual name as one of the outcomes of the settlement between the Crown and a collective of several local iwi, Taranaki Whānui ki te Upoko o te Ika, for breaches of the Treaty of Waitangi.
File:Shoshonite lava flows on South Table Mountain, Colorado. Shoshonite is a type of igneous rock.More specifically, it is a potassium-rich variety of basaltic trachyandesite, [1] composed of olivine, augite and plagioclase phenocrysts in a groundmass with calcic plagioclase and sanidine and some dark-colored volcanic glass.
The lava flows formed the conditions for the creation of Lake Superior agates. As the lava solidified, water vapor and carbon dioxide trapped within the solidified flows formed a vesicular texture (literally millions of small bubbles). Later, groundwater transported ferric iron, silica, and other dissolved minerals passed through the trapped ...
Scoria is a pyroclastic, highly vesicular, dark-colored volcanic rock formed by ejection from a volcano as a molten blob and cooled in the air to form discrete grains called clasts. [ 1 ] [ 2 ] It is typically dark in color (brown, black or purplish-red), and basaltic or andesitic in composition.
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