In an unconformity between two layers of rock, how is the upper layer usually described? much younger than the lower layer the same age as the lower layer a little older than the lower layer much older than the lower layer correct answer is much younger than the lower layer

Pegmatites are igneous rocks in which the individual minerals are very large. typically, the minerals are all light-colored quartz, feldspar and muscovite. if you were given a black and white photograph of a pegmatite in a quarry (where the rock has been blasted and broken), what physical properties could you use to identify those three minerals in this hypothetical photo? describe each mineral and the specific diagnostic properties. be specific.