Glassy Texture Igneous Rock

The high silica sio 2 concentrations found in felsic rocks rhyolite composition causes a rock to form a glass much more readily than it would in low silica rocks such as basalt. An igneous rock with a glassy texture cooled from its liquid state very quickly an example of this would be obsidian a volcanic glass. Phaneritic fan a rit ic rocks have mineral grains that are large enough to be seen with the naked eye or a hand lens like this granite.

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Magma can cool to form an igneous rock either on the surface of the earth.

Glassy texture igneous rock. An igneous rock is any crystalline or glassy rock that forms from cooling of a magma. A magma consists mostly of liquid rock matter but may contain crystals of various minerals and may contain a gas phase that may be dissolved in the liquid or may be present as a separate gas phase. Igneous textures include the rock textures occurring in igneous rocks igneous textures are used by geologists in determining the mode of origin igneous rocks and are used in rock classification. Aphanitic a not phaner visible rocks in contrast to phaneritic rocks typically form.

Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. Phaneritic texture james st. Igneous textures include the rock textures occurring in igneous rocks 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.

The texture of a rock provides a clue whether the magma cooled fast or slowly and where the rock was formed. Slower cooling either beneath earth s surface or within very thick masses of lava promotes the formation of crystals and under favourable circumstances of magma composition and other factors. However composition is also vitally important. Superficially a glassy texture suggests cooling that was so extremely fast that no crystals could form.

The following terms are commonly used to describe the texture of igneous rocks. Introduction to igneous rocks. In general igneous rocks formed underground have mineral of larger size than the igneous rocks formed above the ground. Pumice is another type of igneous rock with a glassy texture.

Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. There are six main types of textures. Aphanitic and glassy textures represent relatively rapid cooling of magma and hence are found mainly among the volcanic rocks.