what are the six types of igneous rock textures?
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There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic. Aphanitic (a = not, phaner = visible) rocks, in contrast to phaneritic rocks, typically form from lava which crystallize rapidly on or near Earth's surface.
724737
Typical intrusive formations are batholiths, stocks, laccoliths, sills and dikes. When the magma solidifies within the earth's crust, it cools slowly forming coarse textured rocks, such as granite, gabbro, or diorite. The central cores of major mountain ranges consist of intrusive igneous rocks, usually granite.
1111387
The two major types of texture in metamorphic rocks are foliated rocks, which indicate an alignment of platy minerals; and nonfoliated (granular) rocks, which have no preferred alignment of minerals (may indicate a lack of platy minerals).
842990
Igneous rocks form when molten magma cools and solidifies. Metamorphic rocks form when a rock is chemically changed by heat or pressure to form a new rock type. Sedimentary rocks form when fragments of rocks and other debris are cemented together. types of igneous rock: extrusive and intrusive.
93153
['6 Characteristics for Rocks And Minerals! There are 6 types of characteristics for rocks and minerals. ... ', 'Hardness. The mohs hardness scale.', 'Lustre. The lustre comparison.', 'Colour. This is a comparison of different colours of the minerals.', 'Crystal Structure. ... ', 'Streak. ... ', 'Cleavage and Fracture.']
404798
There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium.
866135
What are igneous rocks like? Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidified: magma that cools slowly will form an igneous rock with large crystals.
416022
The type of igneous rocks that form from magma is a function of three factors: the chemical composition of the magma; temperature of solidification; and the rate of cooling which influences the crystallization process.
353470
When the magma solidifies within the earth's crust, it cools slowly forming coarse textured rocks, such as granite, gabbro, or diorite. The central cores of major mountain ranges consist of intrusive igneous rocks, usually granite.
706229
['Lithosphere.', 'Asthenosphere.', 'Mesosphere.', 'Outer core.', 'Inner core.']
514257
A cross section of a composite volcano reveals alternating layers of rock and ash: (1) magma chamber, (2) bedrock, (3) pipe, (4) ash layers, (5) lava layers, (6) lava flow, (7) vent, (8) lava, (9) ash cloud.
893359
Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidified: magma that cools slowly will form an igneous rock with large crystals. lava that cools quickly will form an igneous rock with small crystals.
989214
Igneous rocks are formed from lava or magma. Magma is molten rock that is underground and lava is molten rock that erupts out on the surface. The two main types of igneous rocks are plutonic rocks and volcanic rocks. ... When magma cools underground, it cools very slowly and when lava cools above ground, it cools quickly.
1440103
['Chemical Composition of the Protolith. The type of rock undergoes metamorphism is a major factor in determing what type of metamorphic rock it becomes. ... ', 'Temperature. ... ', 'Pressure. ... ', 'Fluids. ... ', 'Time. ... ', 'Regional Metamorphism. ... ', 'Contact Metamorphism. ... ', 'Hydrothermal Metamorphism.']
1457119
The high temperatures and pressure under Earth's crust keep magma in its fluid state. There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide.
309494
The texture of an igneous rock depends on the size of the crystals in the rock. This tells us if the rock is plutonic or volcanic. When magma cools underground, it cools very slowly and when lava cools above ground, it cools quickly. When magma and lava cool, mineral crystals start to form in the molten rock.
1112006
['mineral composition, structure and texture;', 'bedding, jointing and anisotropy;', 'water content;', 'state of stress in the rock mass.']