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searching for Extrusive rock 12 found (44 total)

Tephrite (96 words) [view diff] no match in snippet view article find links to article

Tephrite is an igneous, volcanic (extrusive) rock, with aphanitic to porphyritic texture. Mineral content is usually abundant feldspathoids (leucite or

Basanite (773 words) [view diff] no match in snippet view article find links to article

Basanite (/ˈbæs.əˌnaɪt/) is an igneous, volcanic (extrusive) rock with aphanitic to porphyritic texture. It is composed mostly of feldspathoids, pyroxenes

Pitchstone (276 words) [view diff] exact match in snippet view article find links to article

mottled, streaked, or uniform brown, red, green, gray, or black. It is an extrusive rock that is very resistant to erosion. The pitchstone ridge of An Sgùrr

Boninite (941 words) [view diff] exact match in snippet view article find links to article

Boninite is an extrusive rock high in both magnesium and silica, thought to be usually formed in fore-arc environments, typically during the early stages

List of rock types (2,209 words) [view diff] exact match in snippet view article find links to article

Blairmorite – Rare porphyritic volcanic rock Boninite – Ultramafic extrusive rock high in both magnesium and silica Carbonatite – Igneous rock with more

Geology of Shropshire (3,555 words) [view diff] exact match in snippet view article find links to article

pinkish colour and is usually banded as it is a slow cooling viscous extrusive rock. Intrusions of igneous rock have been quarried in the past at nearby

Idaho Batholith ecoregion (2,936 words) [view diff] exact match in snippet view article find links to article

fishing. Rhyolite is the same as granite chemically; however it is an extrusive rock, whereas granite is an intrusive rock. Lucky Peak State Park offers

Sheeted dyke complex (1,117 words) [view diff] exact match in snippet view article find links to article

cooling and creates basaltic formations such as pillow lava, a common extrusive rock created near areas of volcanic activity on the seafloor. Although some

Duluth Complex (2,457 words) [view diff] exact match in snippet view article find links to article

Duluth and Beaver Bay complexes are interspersed with and underlie the extrusive rock of the North Shore Volcanic Group. The Beaver Bay Complex occupies the

Adel Mountains Volcanic Field (1,862 words) [view diff] exact match in snippet view article find links to article

Medicine Formation on the edge of the Great Falls Tectonic Zone. The extrusive rock is composed of breccia and conglomerate. The intrusive rock has formed

Widgiemooltha Komatiite (2,192 words) [view diff] exact match in snippet view article find links to article

Komatiite is the Mt Edwards Basalt, which is a low to medium MgO mafic extrusive rock, metamorphosed to upper greenschist facies. Mineralogy is chlorite,

Glossary of geology (10,307 words) [view diff] exact match in snippet view article find links to article

dacite An igneous, volcanic rock with a high iron content. It is an extrusive rock of the same general composition as andesite, but a less calcic feldspar