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The origin of a rock can often be detected from its texture—the sizes and orientations of its mineral or rock fragment components.Most extrusive rocks are fine grained, meaning their mineral components (grains) are less than 1 millimeter in diameter.Lava flow rocks typically have a chilled margin that is very fine grained, or aphanitic. Grain size then increases progressively toward the.
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Each rock name has a specific texture that defines and distinguishes it, with their descriptions listed below. Slate is a fine-grained metamorphic rock that exhibits a foliation called slaty cleavage that is the flat orientation of the small platy crystals of mica and chlorite forming perpendicular to the direction of stress.
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Examples of intrusive igneous rocks are: diabase, diorite, gabbro, granite, pegmatite, and peridotite. Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass. These rocks include: andesite, basalt, dacite, obsidian, pumice, rhyolite, scoria, and tuff.
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Examples of rocks with aphanitic texture are obsidian or pumice. Phaneritic - Comes from phaner meaning "visible". Examples of rocks with phaneritic texture are diorite or granite. Porphyritic - Named for the texture of the rock porphyry and has a few large grains in a matrix of grains too small to see.
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Alternatively, rocks like basalt and obsidian have very small grains and a relatively fine texture. This happens because when magma erupts into lava, it cools more quickly than it would if it stayed inside the earth, giving crystals less time to form.. the gas bubbles are trapped and end up giving the rock a bubbly texture. An example of.
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Figure 4.1.1 4.1. 1: Porphyritic texture. Some igneous rocks have a mix of coarse-grained minerals surrounded by a matrix of fine-grained material in a texture called porphyritic. The large crystals are called phenocrysts and the fine-grained matrix is called the groundmass or matrix.
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Chapter 3: Igneous Textures • 3.1.1 Rates of nucleation, growth, & diffusion - The relative rates of initial nucleation, crystal growth and diffusion will have considerable influence on the ultimate texture of the resulting rock • However, whichever rate is the slowest will be the overall rate-determining process and exert the most
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Intrusive rocks, also called plutonic rocks, cool slowly without ever reaching the surface. They have large crystals that are usually visible without a microscope. This surface is known as a phaneritic texture. Perhaps the best-known phaneritic rock is granite. One extreme type of phaneritic rock is called pegmatite, found often in the U.S.
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Igneous rocks that are composed of crystals too small to see (unless you have a microscope) are called aphanitic igneous rocks. Figure 8.3C, 8.4A, and 8.4C are aphanitic rocks. Because Figure 8.3C and 8.4A are dark in color, they are mafic aphanitic rock called basalt.. The texture of such a rock is referred to as porphyritic, or more.
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