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The smooth texture of this basaltic volcanic bomb is aphanitic The six main types of textures are phaneritic, aphanitic, porphyritic, glassy, pyroclastic, and pegmatitic. Iugs classification of aphanitic extrusive igneous rocks according to their relative alkali (na 2 o + k 2 o) and silica (sio 2) weight contents
Blue area is roughly where alkaline rocks plot Igneous textures are used by geologists in determining the mode of origin of igneous rocks and are used in rock classification Yellow area where subalkaline rocks plot
Phaneritic and aphanitic are textural classifications used for igneous rocks, those formed from the cooling and solidification of molten rock (magma or lava)
The key distinction between these two categories lies in the size of the mineral grains within the rock Phaneritic and aphanitic are two main types of igneous rock textures. Igneous rocks are classified based on texture and composition Texture describes the physical characteristics of the minerals, such as grain size
This relates to the cooling history of the molten … This texture typically indicates that the rock cooled rapidly from molten lava, preventing larger crystals from forming, which often occurs in extrusive igneous environments Aphanitic rocks are commonly associated with. The individual crystals in an aphanitic igneous rock are not distinguishable to the naked eye
Examples of aphanitic igneous rock include basalt, andesite and rhyolite
Glassy or vitreous textures occur during some volcanic eruptions when the lava is quenched so rapidly that crystallization cannot occur. Other articles where aphanitic texture is discussed Classification by grain or crystal size Aphanitic is a descriptive term for small crystals, and phaneritic for larger ones
Very coarse crystals (those larger than 3 centimetres, or 1.2 inches) are termed pegmatitic. Table 4.1 summarizes the key differences between intrusive and extrusive igneous rocks. Igneous rock textures depend on how fast the rock cools and other factors like crystal growth There are nine main types of igneous rock textures, each with different and unique characteristics
Igneous rock grains can differ in shapes, such as equant, tabular, acicular, fibrous, or prismatic.
Anorthosite from the stillwater igneous complex (neoarchean Montana) igneous textures include the rock textures occurring in igneous rocks
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