Florida state shell is the Horse Conch.
At least 535 million years ago, mollusks acquired the ability to secrete a carbonate of lime solution that formed a hard, protective shell around them. The word “conch” comes from a Greek word meaning “shell.”
The shell color is bright orange in very young individuals. The shell often becomes greyish white to salmon-orange when adult. The shell is popular with shell collectors partly because of its great size.