volcanic minerals

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• Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… …   Wikipedia

• Volcanic arc — Mariana Islands, an oceanic island arc A volcanic arc is a chain of volcanoes positioned in an arc shape as seen from above. Offshore volcanoes form islands, resulting in a volcanic island arc. Generally they result from the subduction of an… …   Wikipedia

• volcanic dome — USGS PHOTO GLOSSARY OF VOLCANIC TERMS Volcanic domes are rounded, steep sided mounds built by very viscous magma, usually either dacite or rhyolite. Such magmas are typically too viscous (resistant to flow) to move far from the vent before… …   Glossary of volcanic terms

• List of minerals — This is a List of minerals for which there are Wikipedia articles. Mineral variety names and mineraloids are to be listed after the valid minerals for each letter.For a complete listing (about 4,000) of all mineral names: List of minerals… …   Wikipedia

• Mount Edziza volcanic complex — Mount Edziza, one of the main volcanoes of the Mount Edziza volcanic complex Elevation …   Wikipedia

• Potrillo volcanic field — The Potrillo Volcanic Field is a monogenetic volcanic field located on the Rio Grande Rift in New Mexico, USA and Chihuahua, Mexico. It lies convert|35|km|mi|0 west of El Paso, Texas. Rio Grande Rift *Rifting began in Late Oligocene cite book |… …   Wikipedia

• Common types of volcanic rock — ▪ Table Common types of volcanic rock name silica content (percent) major minerals colour approximate density with no voids (grams per cubic cm) basalt 45 53 Ca feldspar, pyroxene, olivine dark gray 3.0 andesite 53 62 CaNa feldspar, pyroxene,… …   Universalium

• Tongariro Alpine Crossing — OverviewThe Tongariro Alpine Crossing in Tongariro National Park is one of New Zealand s most spectacular tramping tracks, and the most famousFact|date=April 2008 one day tramp in New Zealand. The crossing passes (roughly speaking) over the… …   Wikipedia

• Agglomerate — Agglomerates (from the Latin agglomerare meaning to form into a ball ) are coarse accumulations of large blocks of volcanic material that contain at least 75% bombs. Volcanic bombs differ from volcanic blocks in that their shape records fluidal… …   Wikipedia

• Fredericktown, Missouri —   City   L …   Wikipedia

• Rhynie chert — The Rhynie chert is an Early Devonian Lagerstättefound near the village of Rhynie, Aberdeenshire, Scotland, containing exceptionally preserved plant, fungus, lichen and animal material petrified in three dimensions by covering with fast setting… …   Wikipedia