predict the formula unit of each of the following compounds (with the criss cross method) it's a must to use the criss-cross method plzzz 1:Aluminum Iodide, 2:Calcium bicarbonate, 3:Sodium Carbonate, potassium carbonate, zinc fluorida​

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.