Feldspar and mica streaks is what color
Feldspar common milky white, but often because of the impurities it contains is dyed yellow, brown, pink, gray and other colors, some may also have a beautiful color or iridescence.
Muscovite is colorless transparent or light colored; black mica is black to dark brown, dark green color; phlogopite yellow, brown, green or colorless; pale purple, lepidolite rose red to grey
