in fact even though biological races do not exist the concept of race obviously is still a reality as is racism these are prevalent and persistent elements of our everyday lives and generally accepted aspects of our culture thus the concept of human races is real
Common Metamorphic Minerals Metamorphic rocks form when pre-existing rocks (igneous, sedimentary, or metamorphic) are exposed to high temperatures and pressures under the Earth's surface. Some pre-existing minerals, unstable at the higher temperature and pressure conditions, transform into new minerals.Others recrystallize and grow larger.etamorphic rocks tend to be dominated by minerals you already know: feldspar, quartz, muscovite, biotite, amphibole, and calcite/dolomite. However, a few minerals are found exclusively or mainly in metamorphic rocks:
1 Low-grade metamorphism takes place at temperatures between about 200 to 320 o C, and relatively low pressure. 2  Low grade metamorphic rocks are characterized by an abundance of hydrous minerals (minerals that contain water, H 2 O, in their crystal structure).n general, metamorphic rocks do not undergo significant changes in chemical composition during metamorphism. The changes in mineral assemblages are due to changes in the temperature and pressure conditions of metamorphism.