Coquina is a type of sedimentary rock composed mainly of small shell fragments, primarily from marine organisms like clams and oysters. It forms in coastal environments where these shells accumulate and are compacted over time. Coquina is often light in color and has a porous texture, making it unique among other types of limestone. This rock is commonly found in regions like Florida and is used in construction and landscaping. Its natural beauty and durability make it a popular choice for building materials, especially in coastal areas. Coquina can also be seen in historical structures, showcasing its long-standing significance in architecture.