Bring a large pot of water to just to a boil. You want enough water to comfortably hold all the shrimp. There should be about 1 to 2 inches (2.5 to 5.1 cm) more water than there is shrimp.
The amount depends on the type of mineral. A large group of minerals  the opaque minerals  do not transmit significant light, even in thin section. These minerals do, however , reflect light back that can tell us a great deal about their identity and origin. These minerals typically have significant metallic bonding (e.g., native elements, sulfides, oxides).
Black absorbs light. Therefore none (or very little light) is reflected. The result is a black surface. Objects that are blue say, absorb all the other colors, and reflect ONLY the wavelenth(s) corresponding to that shade of blue. Same holds for any other color. White, on the other hand reflects light.