👉 Plymouthite, also known as "pearl" or "amethyst", is a type of quartz crystal that is often found in the marine environment. It is distinguished from other types of quartz by its unique appearance and color. The chemical composition of Plymouthite can vary depending on the specific species, but it typically contains elements such as iron, magnesium, calcium, and halide ions. Plymouthite is a common mineral in many parts of the world, including North America, Europe