1. A similar situation with igneous rocks occurs when xenoliths are found. 2. Deformational events are often also associated with volcanism and igneous activity. 3. By definition rock formed of solidified magma is called igneous rock. 4. These igneous deposits blanketed the region north of the Yosemite region. 5. Most types of igneous rocks display some degree of porphyritic texture. 6. Nephelinite is an example of a silica-undersaturated igneous rock. 7. Silica-saturated igneous rocks fall in between these two classes. 8. In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved. 9. Labradorite is the principal component of the igneous rock type anorthosite. 10. Examples of aphanitic igneous rock include basalt, andesite and rhyolite.
