Igneous Rock Textures

There are six main types of textures.

Igneous rock textures. Texture refers to degree of crystallinity grain size and geometrical relationships between the cons tituents of a rock fabric. Each kind of texture has a variety of different characteristics that make them unique. Porphyritic rocks the two images below show a hand sample and a thin section of porphyritic aphanitic textured rocks. The size and shape of the mineral grains or crystals and the pattern of their arrangement give a texture to the rock.

Textures of igneous rocks. 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. What determines igneous rock texture. Properties of igneous rock textures.

The diffusion rate the rate at which atoms or molecules can move diffuse through the liquid. Other factors involved are. Texture of a rock is the appearance of the rock and how one feels touching it. 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.

Porphyritic texture is really a subtype but usage of the term often confuses the beginner. Aphanitic a not phaner visible rocks in contrast to phaneritic rocks typically form. Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. The main factor that determines the texture of an igneous rock is the cooling rate dt dt other factors involved are.

Igneous rock derived from the latin word ignis meaning fire or magmatic rock is one of the three main rock types the others being sedimentary and metamorphic igneous rock is formed through the cooling and solidification of magma or lava the magma can be derived from partial melts of existing rocks in either a planet s mantle or crust. Other factors include the diffusion rate which is how atoms and molecules move through the liquid. The main factor that determines the texture of an igneous rock is the cooling rate dt dt. It all comes down to the rate at which the rock cools.

Yosemite made from granitic rock. Textures of igneous rocks. The texture of a rock provides a clue whether the magma cooled fast or slowly and where the rock was formed. 1 textures of the igneous rocks structure large scale features recognizable in the field such as banding lineation jointing and vesicularity.

Below is a list of the different types of igneous rock texture. Igneous rocks are identified by knowing two main features texture and color. Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. Degree of crystallinity holocrystalline composed wholly of crystals.

Andesitic compositions are somewhere between basaltic and granitic in density color and the explosive nature of an eruption. The diffusion rate the rate at which atoms or molecules can move diffuse through the liquid.