Yes, there can be variations in color in Australias Callide Mica Schist. The predominant color is often a mix of silvery grey, green, and black with shimmering mica flakes, but there can be variations in the intensity of these colors and the amount of mica present. Additionally, some samples of Callide Mica Schist may have streaks of red or rust-colored minerals running through them, adding further color variation.