When pink crystalline compound was heated, the solid changed colour from pink to blue and steam was driven off. After the tube had cooled down, water was added to the contents of the test tube and the pink colour returned. Which term describes the change that took place?

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.