Which describes mendeleevs use of the term eka-aluminum? ? a.) a mixture of aluminum and an unknown element b.) an element predicted to have properties similar to aluminum c.) a compound that contains aluminum d.) a rare isotope of aluminum

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.