Another word for extrusive is volcanic. Rock Cycle Site 1. Volcanic Calcite Carbonatite Alvikite Igneous Rock Igneous Rock These are terms that are used by geologists to describe igneous rocks based upon their silica content. . Type of hard igneous rock. Rock formed by the solidification of molten magma. Classify the rock as either intrusive or extrusive and identify another word used to describe this type of rock. Go back to step 2 and put the name of each process illustrated in the animation on the appropriate arrow. Answercalcite gypsum feldspar pyrite feldspars gold quartz diamond amphiboles micas olivine garnet calciteand pyroxenes. List the rock-forming minerals. Forced while molten through cracks in the earths surface. In geology the term xenolith is almost exclusively used to describe inclusions in igneous rock during magma emplacement and eruption. 142 143 You will be introduced to Igneous rock sa...