magmaattiset

Magmaattiset is a Finnish term referring to igneous rocks, which are formed through the cooling and solidification of molten rock material, known as magma or lava. These rocks are one of the three main rock types, alongside sedimentary and metamorphic rocks. Magmaattiset rocks are broadly categorized into two main groups based on their formation location: intrusive (or plutonic) and extrusive (or volcanic).

Intrusive magmaattiset rocks, such as granite, form when magma cools slowly deep beneath the Earth's surface. This slow cooling allows for the formation of larger mineral crystals, giving these rocks a coarse-grained texture. Extrusive magmaattiset rocks, like basalt, form when lava cools rapidly on the Earth's surface after volcanic eruptions. The rapid cooling results in smaller mineral crystals, leading to a fine-grained or even glassy texture.

The composition of magmaattiset rocks varies widely depending on the source magma. Key minerals found in these rocks include quartz, feldspar, mica, and amphibole. Their chemical composition, particularly the silica content, determines their classification into felsic (e.g., granite, rhyolite), intermediate (e.g., diorite, andesite), or mafic (e.g., gabbro, basalt) types. Magmaattiset rocks are significant in understanding Earth's geological history and volcanic activity, and they are often used as building materials and in the creation of industrial products.