Other Characteristics: vesicular like pumice, but denser and darker with larger vesicles. 16. Crystals in magma grow in a similar way as the melt cools. Cooling rate and gas content create other textures (see Figure below for examples of different textures). As magma cools, it begins to crystallise and form solid rock. Which rock is sedimentary in origin and formed as a result of chemical processes? Phaneritic: coarse grain, individual crystals are visible - slow cooling. (1) plutonic with slow cooling (2) plutonic with rapid cooling (3) volcanic with slow cooling (4) volcanic with rapid cooling . GABBRO BASALT DIORITE ANDESITE (PORPHYRY) GRANITE RHYOLITE PUMICE OBS ID AN Cooling History/Texture Slow Cooling and Coarse Grained Fast Cooling and Fine Grained Very Fast Cooling and Glassy/Cellular Mafic and Dark Color Felsic What is the origin and rate of formation of this rock? Igneous Rock Textures and Cooling Rates ! Diorite is slowly crystallized inside the earth. The differences between Andesite and Diorite are in their grain size and their cooling rate. Diorite slowly crystallized inside the Earth. Diorite produced coarse grain sizes from slow cooling. Diorite, gabbro, anorthosite — the three root names in this field are separated according to the colour index and the average composition of their plagioclase ... the main difference between these two rocks is the formation process or the cooling rate of the liquid rock that they initiate. The video below is a clip of crystals forming in solution. The same magma on Andesite and Diorite rapidly crystallizes on the Earth's surface and forms Andesite. Identify the cooling rate (fast, slow, or two-staged) and cooling environment (magma chamber, eruption from volcano, or deep cooling followed by eruption) of the rock in each image. Click each image to examine the rock's texture and infer its cooling rate and environment. Grain Size & Cooling Rate. Which is more likely, a granite dike, a diorite dike or a gabbro dike? Lavas that cool extremely rapidly may have a glassy texture. The rate of cooling is proportional to the difference in temperature between the bodies in contact with heat flowing from the warmer body to the cooler body. The maximum cooling rate increases as the amount of soot increases in the quench oil. — One forms from cooling magma, and one forms from cooling lava. The higher the rate of cooling the smaller the size of the crystals. ... very rapid cooling slow cooling slow followed by rapid cooling none of the above. Intrusive Equivalent: diorite or gabbro. 3. This rapid cooling provides a rock with small crystals. — They cooled at different rates. This slow cooling gives a large grain size. Tectonic Environment: Divergent Boundary or Intra-oceanic hot spots Cooling Rate: rapid, extrusive. Igneous rocks are made up of several different mineral crystals that grow within the melt as it cools. — One is extrusive and one is intrusive. Mineral Composition: Predominantly Glass. This probably is due to the very fine soot particles functioning as nucleation sites for bubble formation during nucleate boiling. Andesite forms when magma quickly crystallizes on the surface of the earth. Origin: Extrusive/Volcanic. However, additions of soot also caused the temperature at maximum cooling to decrease. The rate of cooling of a magma or lava is reflected by the _____ of the rock. Diorite is plutonic and andesite is volcanic. — They formed differently 10. granite diorite gabbro. — They have different grain sizes or textures. ... Diorite was used extensively by ancient civilizations for vases and other decorative artwork and is still used for art today (Figure below). Differences - in grain size and cooling rate. 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