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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.
Outcrops of Mississippian rocks run parallel to Devonian rocks across central Ohio and paralleling the Lake Erie shore. In fact, Mississippian outcrops form a band of hills five to 10 miles south of the lake. In general the Mississippian rocks are moderately fossiliferous, with good crinoid preservation in Cuyahoga Formation.
Volcanic rocks (often shortened to volcanics in scientific contexts) are rocks formed from lava erupted from a volcano. Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and metamorphic rocks and constitute an important element of some sediments and sedimentary rocks .
Helenite, also known as Mount St. Helens obsidian, emerald obsidianite, and ruby obsidianite, is a glass made from the fused volcanic rock dust from Mount St. Helens and marketed as a gemstone. [1] [2] Helenite was first created accidentally after the eruption of Mount St. Helens in 1980.
Around March 2022, construction of a rock-climbing wall began at the park, to be 160 feet tall and about 1/2-mile wide, utilizing stones leftover from the quarry site. [2] Designed by Via Ferrata Works, it will be the first urban via ferrata in the United States. [3] The attraction opened in May 2023. [4]
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Trachybasalt – Volcanic rock – A volcanic rock with a composition between basalt and trachyte Hawaiite – Volcanic rock – a sodic type of trachybasalt, typically formed by ocean island volcanism; Trachyte – Extrusive igneous rock – A silica-undersaturated volcanic rock; essentially a feldspathoid-bearing rhyolite
Fiamme in the Resting Spring Tuff near Shoshone, California. Rocks from the Bishop tuff, uncompressed with pumice on left; compressed with fiamme on right.. Fiamme are lens-shapes, usually millimetres to centimetres in size, seen on surfaces of some volcaniclastic rocks.