👉 Ichthyophthalmite is a mineral that occurs in the Earth's crust. It is composed of calcium phosphate crystals, which are found in certain types of fish and sea creatures. Ichthyophthalmite has a grayish-brown color and can be found in various shapes and sizes on the surface of rocks. The term "ichthyophthalmite" comes from the Greek word for "fish," as it is often found in the crust of marine animals such as fish, squid, and
