Texture Of Igneous Rocks

The main factor that determines the texture of an igneous rock is the cooling rate dt dt other factors involved are.

Texture of igneous rocks. You must be able to identify the common textures of igneous rocks highlighted in bold text below and understand how they form figures 1 and 2. Other factors involved are. There are six main types of textures. Pegmatitic texture occurs during magma cooling when some minerals may grow so large that they become massive the size ranges from a few centimetres to several metres.

Textures of igneous rocks. It all comes down to the rate at which the rock cools. Properties of igneous rock textures. Yosemite made from granitic rock.

Igneous textures 3 1 1 rates of nucleation growth diffusion the relative rates of initial nucleation crystal growth and diffusion will have considerable influence on the ultimate texture of the resulting rock however whichever rate is the slowest will be the overall rate determining process and exert the most. Phaneritic aphanitic porphyritic glassy pyroclastic and pegmatitic. Texture of a rock is the appearance of the rock and how one feels touching it. The texture of a rock is the size shape and arrangement of the grains for sedimentary rocks or crystals for igneous and metamorphic rocks.

Also of importance are the rock s extent of homogeneity i e uniformity of composition throughout and the degree of. The diffusion rate the rate at which atoms or molecules can move diffuse through the liquid. Andesitic compositions are somewhere between basaltic and granitic in density color and the explosive nature of an eruption. Below is a list of the different types of igneous rock texture.

Textures of igneous rocks. Each kind of texture has a variety of different characteristics that make them unique. As magma cools slowly the minerals have time to grow and. Phaneritic phaner visible textures are typical of intrusive igneous rocks these rocks crystallized slowly below the earth s surface.

The textures of an igneous rocks is a description of its constituent parts and their sizes shapes and arrangement. The main factor that determines the texture of an igneous rock is the cooling rate dt dt. 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.

The diffusion rate the rate at which atoms or molecules can move diffuse through the liquid. Other factors include the diffusion rate which is how atoms and molecules move through the liquid. The texture of a rock provides a clue whether the magma cooled fast or slowly and where the rock was formed. This is typical of pegmatites.

Igneous rocks are identified by knowing two main features texture and color.