Glassy Texture Of Igneous Rocks

Aphanitic and glassy textures represent relatively rapid cooling of magma and hence are found mainly among the volcanic rocks. 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. Phaneritic vesicular aphanitic porphyritic poikilitic glassy pyroclastic equigranular and spinifex.

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Step 3 identify the texture s of the rock.

Glassy texture of igneous rocks. Each kind of texture has a variety of different characteristics that make them unique. Properties of igneous rock textures. Aphanitic a not phaner visible rocks in contrast to phaneritic rocks typically form. 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.

Introduction to igneous rocks. Step 1 estimate the rock s mafic color index mci. Superficially a glassy texture suggests cooling that was so extremely fast that no crystals could form. What determines igneous rock texture.

Step 2 identify the main rock forming minerals if the mineral crystals are large enough to do so and estimate the relative abundance of each mineral. 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. The texture of a rock provides a clue whether the magma cooled fast or slowly and where the rock was formed. An igneous rock is any crystalline or glassy rock that forms from cooling of a magma.

Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. However composition is also vitally important. There are nine main types of igneous rock textures. There are six main types of textures.

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. 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. In general igneous rocks formed underground have mineral of larger size than the igneous rocks formed above the ground.

Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. The following terms are commonly used to describe the texture of igneous rocks. Step 4 use the igneous rock classification flowchart to name the rock. Igneous rock analysis and classification.

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