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Sonam Dixit posted an Question
October 20, 2020 • 18:35 pm 30 points
  • IIT JAM
  • Geology (GG)

Fig.: four textures common in lgneous us mineralogically and chemically, intrusive rocks are essentially identical to volcanic to volcanic rocks are fine-graine

Fig.: Four Textures Common in lgneous us Mineralogically and chemically, intrusive rocks are essentially identical to volcanic to Volcanic rocks are fine-grained (or glass) due to their rapid solidification, intrusive are generally Coarse-grained, which is inferred to mean that the magma cnsta slowly underground EDMM NOTE 9 sanfirmed that most of the minerals in these rocks can form i that some of the minerals col dan

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    Sajan sarthak best-answer

    Igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. There are six main types of textures; phaneritic, aphanitic, porphyritic, glassy, pyroclastic and pegmatitic. Phaneritic:+textures are typical of intrusive igneous rocks, these rocks crystallized slowly below Earth's surface. As magma cools slowly the minerals have time to grow and form large crystals. Aphinitic: typically form from lava which crystallize rapidly on or near Earth's surface.  Porphyritic textures develop when conditions during cooling of a magma change relatively quickly. The earlier formed minerals will have formed slowly and remain as large crystals, Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. Pyroclastic (pyro = igneous, clastic = fragment) textures occur when explosive eruptions blast the lava into the air resulting in fragmental, typically glassy material which fall as volcanic ash, lapilli and volcanic bombs.

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