Fossil resin is a type of organic material that has been preserved in the earth's crust for millions of years. It is often found in sedimentary rocks and can be used to make jewelry or other decorative items. The three most common types of fossil resin are AMBER, retinite, and COPAL. AMBER is a yellowish-brown material that is formed from the resin of ancient trees. Retinite is a black, glassy material that is formed from the resin of ancient plants. COPAL is a white, waxy material that is formed from the resin of ancient insects. All three types of fossil resin are highly valued for their unique properties and beauty.