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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 .
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.
These structures are lighter colored than the host rock and typically range in diameter from 0.05mm to over 5 cm. [1] [2] [3] In 1648, Aldrovandi created the term variolite for aphanitic or fine-grained igneous rocks containing varioles. [4] [5] The weathering of varioles often cause variolites to have a pock-marked appearance.
Hawaii’s signature barbecue style is best exemplified by the state’s most famous dish: kalua pig, which cooks for hours in an underground pit (called an imu) heated with hot volcanic rocks and ...
Known for its sauces, including a special volcano sauce for spice lovers, the Whole Hog Cafe has some of the top-ranked barbecue and three locations in Little Rock. Pulled-pork sandwiches are just ...
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
Basalt is also the principal volcanic rock in many oceanic islands, including the islands of Hawaiʻi, [35] the Faroe Islands, [83] and Réunion. [84] The eruption of basalt lava is observed by geologists at about 20 volcanoes per year. [85] Paraná Traps, Brazil. Basalt is the rock most typical of large igneous provinces.
Dacite from the Lassen Volcano National Park. Dacite (/ ˈ d eɪ s aɪ t /) is a volcanic rock formed by rapid solidification of lava that is high in silica and low in alkali metal oxides. It has a fine-grained to porphyritic texture and is intermediate in composition between andesite and rhyolite.