Basalt is an extrusive igneous rock primarily composed of plagioclase feldspar, pyroxene, and sometimes olivine. It is characterized by a fine-grained or aphanitic texture and …

Obsidian is an extrusive igneous rock characterized by its glass-like appearance and lack of a crystalline structure. This unique rock is typically black or dark …

Scoria is an extrusive igneous rock characterized by its vesicular or porous texture, which results from the release of volcanic gases during the rock’s formation. …

Rhyolite is an extrusive igneous rock characterized by its fine-grained or aphanitic texture, formed by the rapid cooling of high-silica magma. Its class is felsic, …

Dacite is an extrusive igneous rock that is predominantly felsic in composition, characterized by its intermediate to high silica content. It typically exhibits a fine-grained …