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";s:4:"text";s:2557:"In contrast, when magma solidifies outside the Earth's surface, it forms an extrusive igneous rock. Notice the large grains of pink, white, and gray minerals. Extrusive. The single feature that is diagnostic to all pegmatites is their large size crystal components. Examples include basalt, rhyolite, andesite, and obsidian. Related Questions. The two main categories of igneous rocks are extrusive and intrusive. Here, the words consist of garnet and tourmaline. Quartz can be found in many forms in igneous rocks, from large crystals in pegmatitic granites, to crystoballite glass in andesites, hence quartz can be both extrusive and intrusive. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains. For instance, a rock called pegmatite is formed by the crystallization of magma enriched with water in the veins of other rocks, and may contain beryl, tourmaline and topaz. extrusive. Many mountain ranges, such as the Sierra Nevada in California, are formed mostly from large granite (or related rock) intrusions; see Sierra Nevada batholith.. Related forms. These rocks include andesite, basalt, obsidian, pumice, rhyolite, scoria, and tuff. extrusive. rhyolite - intrusive or extrusive? Formation. If they erupt from volcanoes onto the surface as lava, they are called extrusive rocks.By contrast, Intrusive rocks are formed from magma that cools underground. Specimen is about 4.5 x 3.5 x 3.5 centimeters. Pegmatite bodies are usually of minor size compared to typical intrusive rock bodies. Pegmatite body size is on the order of magnitude of one to a few hundred meters. Start studying IGNEOUS ROCKS. For instance, a rock called pegmatite is formed by the crystallization of magma enriched with water in the veins of other rocks, and may contain beryl, tourmaline and topaz. An extrusive igneous rocks definition states these rocks form when magma "exits and cools above (or very near) the Earth's surface." ... granite pegmatite - intrusive or extrusive? A pegmatite … Is pegmatite a intrusive or extrusive? Extrusive igneous rocks form when magma reaches the Earth's surface a volcano and cools quickly. Which rock has the same composition as granite but has very large, usually light, crystals? What type of igneous rock is pegmatite (intrusive or extrusive)? Examples of intrusive igneous rocks are diorite, gabbro, granite, pegmatite, and peridotite.Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. 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