Una esfera que pesa 100N esta situada en un hueco, formado entre una pared lisa y un plano liso. Para este ultimo, forma un angulo de 60ºrespecto de la horizontal

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.