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).
The glass may be able to resist 200kg of evenly distributed load, but that is very different from a rock. First, this is impact not a uniform load. Second, the rock may have a hardness similar to the glass. Hardness is huge. I can break a big piece of tempered glass with a little ceramic chip.