What are the types of acidic igneous rocks?

Accessory minerals: apatite, magnetite, zircon. Secondary minerals: sericite, chlorite, epidot. Rock types: tonalite: Feldspars are represented almost exclusively by Na-rich plagioclase. Locations in the Carpathian-Pannonian region: Mórágy; Calimani, Stiavnica-Kremnica (Central Slovakian volcanic complex). read more

Two major divisions include volcanic or extrusive rocks that form when magma is ejected from the Earth's crust, and intrusive rocks, which are created below the surface. Major minerals present in igneous rocks include quartz, feldspars, foids, mica, augiste, hornblende, and olivine. read more

Based on the presence of acid forming radical, silicon, igneous rocks are divided into Acid Rocks and Basic Rocks. Acid Rocks. These are characterized by high content of silica—up to 80 per cent, while the rest is divided among aluminium, alkalis, magnesium, iron oxide, lime etc.. These rocks constitute the sial portion of the crust. read more

Volcanic rocks 4. Other igneous rocks. Common plutonic rocks. Plutonic rocks are igneous rocks that are formed deep under the Earth's surface and have a coarse grain size. They can be separated into acidic, basic and ultrabasic types, according to their mineral and chemical composition. Acidic plutonic rocks. Granite: the most common igneous plutonic rock. read more