Igneous rocks 0.0 / 5 ? GeologyIgneous rocksA2/A-levelOCR Created by: atomic4Created on: 12-12-20 12:11 Igneous rocks Those that have cooled from magma 1 of 17 Phenocrysts Large or conspicuous crystals in an igneous rock, much larger than the groundmass 2 of 17 Felsic minerals Light coloured and silica rich 3 of 17 Magma Molten rock, which is beneath the earths surface 4 of 17 Mafic minerals Dark coloured, silica poor and rich in magnesium and iron 5 of 17 Flow banding Formed by friction as the magma or lava slows down near an interface, aligning the minerals as it moves 6 of 17 Conchoidal A fracture that results in a curved surface 7 of 17 Porphyritic A texture where large crystals are completely surrounded by finer groundmass minerals 8 of 17 Amygdaloidal Where there are large vesicles that have beenthat have been filled with a secondary mineral 9 of 17 Ophiolites Sections of the earths oceanic crust that have been tectonically moved onto continental crust 10 of 17 Hypabyssal Igneous rocks form at relatively shallow depths below the surface 11 of 17 Plutonic When igneous rocks form deep below the surface 12 of 17 Equant Crystals have all axes the same length. 13 of 17 Hot spots Formed by a fixed mantle plume bringing magma to the surface 14 of 17 Batholith A very large igneous intrusion with an unidentified depth in the earths crust 15 of 17 Concordant Intrusions parallel to the existing beds 16 of 17 Discordant Intrusions cut across the existing beds 17 of 17
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