Which is not true of binary compounds? a. these contain only two elements. b. the name of the positively charged nonmetal ion is changed to end in –ide. c. the positively charged metal ion is written first. d. these usually consist of a metal and a nonmetal.

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.