Juan takes home $4600 per month from his job as a business analyst. if his only debt obligations are a car loan payment of $690 and a mortgage payment of $860 every month, is he in danger of credit overload?

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.