What is the volcanic rock?
volcanic rock is a fine -grained type of igneous rock, whose matrix usually consists of glass and small crystals. Through rapid cooling of the molten lava so that there is no crystallization of the content of quartz and feldspar, a variety of natural glass called obsidian is formed. The variety, which has large crystals stored in smaller, fine -grained crystals, is called porphyry. Among the type of volcanic rocks are the most common basalt, Andesite and Rhyolite. Also called volcanoes, volcanic rocks can be found in many parts of the world, including a fire ring that surrounds the Pacific Ocean.
igneous rocks are one of the three main groups in the standard classification of rocks; The other two are sedimentary rocks and metamorphic rocks. Cooling and crystallization of magma leads to the formation of igneous rocks. It occurs as molten or partially molten, magma is a mixture of rock particles and crystals, as well as the settlement of liquid and gas on the ground. Theclice factors in the division of igneous rocks into volcanic or extSubvolcanic, pyroclastic and plutonic or disturbing are the structure and size of the particles, the mechanism of formation, the mineral content and the chemical compounds present. Direct evidence that the rock is a igneous type is when it is made directly from the cooling of the materials that flow from the volcanoes.
volcanic rocks have grains that have a size of less than 0.04 inches (1 mm). Obsidian, usually black and occasionally red or brown volcanic rock variety, contains a large amount of silica oxide but low content of volatile content. It can be used as a material for sharp tools and weapons, although its glossy gloss is a semi -perennial gem. Porphyry, which contains crystals of different sizes, occurs in games and window sills. Rocks that are of volcanic origin are good sources of minerals such as sulfur and mercury, and can also be used as construction materials, especially for road construction.
basalt,Hard, dense and dark volcanic rocks, are most abundant and consists of a mixture of compounds such as silica and aluminum oxide, which forms the silicate of the mineral content of the rock. Andesite, whose color ranges from gray to black, is a volcanic rock that can resemble basalt, but contain more minerals such as silica, potassium and sodium. However, this volcanic rock contains less magnesium, iron and calcium than basalt. The light -colored rhyolite has a very high content of silica, and therefore its viscosity can be very high; It also contains quartz and feldspar, but iron and magnesium are rarely present.
other examples of volcanic rocks include pumice, scoria and dacite. Light colored and high silica is used for abrasives and insulators. Scoria is a dark volcanic rock that is also used for insulators, while Dacite contains quartz and feldspar, with colors from light gray to black.