what factors influence the texture of an igneous rock?

Igneous rocks are defined as types of rocks that are formed when molten rock (rock liquefied by intense heat and pressure) cools to a solid state. … Its texture depends on the shape, size, time period to cool down and solidify, and the arrangement of crystals in the rock.

What does the texture of a rock reveal about how it was formed?

Geologists like igneous textures because they reveal so much about how a rock formed. The first set of textures focuses on the size of mineral crystals. Crystal size primarily reflects the rate of cooling, but is also often strongly affected by rock composition (especially water or gas content).

What does igneous rocks look like?

Extrusive, or volcanic, igneous rocks look dull and do not sparkle much because they are fine grained. … These crystals make a coarse-grained igneous rock called plutonic, or intrusive, igneous rock because the magma was intruded into cracks deep under the earth’s surface.

What are the factors that affect the mineral components and texture of rocks?

The changes in mineral assemblages are due to changes in the temperature and pressure conditions of metamorphism. Thus, the mineral assemblages that are observed must be an indication of the temperature and pressure environment that the rock was subjected to.

Why do igneous rocks develop interlocking texture?

Phaneritic – This texture describes a rock with large, easily visible, interlocking crystals of several minerals. … A phaneritic texture is developed by the slow cooling and crystallisation of magma trapped within the Earth’s crust and is characteristic of plutonic rocks.

Why is texture so important in classifying rock types?

The texture has to do with the sizes and shapes of mineral grains and other constituents in a rock, and how these sizes and shapes relate to each other. Such factors are controlled by the process which formed the rock.

What is the texture of an igneous rock formed from magma that cooled slowly deep underground?

Phaneritic (phaner = visible) textures are typical of intrusive igneous rocks, these rocks crystallized slowly below Earth’s surface. As magma cools slowly the minerals have time to grow and form large crystals.

Igneous Rock Textures

Igneous Rock Textures

Classifying igneous rocks | Describing composition and texture

Igneous Petrology- Igneous Rock Textures / Classifying Rocks Based On Grain Size & Shape | GEO GIRL

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