The origin of the fine-grained material in chondritic meteorites is also unclear. This material is not confined to chondrule rims; some of it is contained in the more general matrix between chondrules ...

Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts ...