Coquina is a poorly cemented limestone that is composed of shells and remains of fossilized invertebrates like brachiopods, mollusks, and trilobites. It gets its name from the Spanish word for shellfish.
- Optical Properties
- Characteristic Physical Properties
- Chemistry & Crystallography
Shells and fossils
Countries of Origin
The Spanish started to use coquina as a building material in Florida in 1598. In St. Augustine, the Castillo de San Marcos and the first lighthouse were constructed using coquina. Because coquina is so soft, cannonballs would embed into the walls of the fort instead of destroying them.
Soluble in hydrochloric acid.