Agatized fossil coral is highly prized by not only fossil collectors, but by gem and mineral collectors, as well. Exquisite forms from Florida are especially in demand as the state produces some of the finest examples of this geological oddity in the entire world. The majority of agatized coral that is collected is either solid inside when sliced or it possesses a drab and rather uninteresting structure to its internal cavity. This remarkable specimen is VERY rare and far exceeds the beauty, color and internal crystalline structures of most agatized coral pieces that are found. Agatized coral specimens found in WHITE and covered in drusy crystals are THE RAREST AND MOST DESIRABLE OF ALL!
Dating all the way back to 38 million years ago, this is a portion of a massive and very rare preserved fossil coral colony. This portion of the coral colony shows a prominent boring hole from an attack of the boring clam Lithophaga. This clam drills deep holes into any substrate that they choose to attach themselves to. This colony was fossilized in the form of a huge geode that had its polyp cavities agatized and later, coated with micro-fine drusy crystals. These rod-like structures then partially detached themselves and again, became mineralized in their disturbed positions.
This specimen is a one-of-a-million type occurrences compared to what is usually discovered! This stunning example possesses a surface completely lined with intensely sparkling drusy crystals which have such a dramatic shimmer that the surface appears to be coated in diamonds. The back side shows original coral polyp colony structures preserved in REVERSE. Of all the typical agatized coral examples found ANYWHERE in the world, RARELY will you ever encounter agatized coral with drusy coated free-standing structures. Agatized coral of this quality is so rare that usually it is cut up and used in very expensive custom jewelry pieces. As a complete crystal specimen, it is worth even more in its natural state.
Agate, also known as chalcedony, is a type of cryptocrystalline quartz (SiO2). Under unique geological conditions, prehistoric corals and mollusks can fossilize by being replaced with agate from silica-rich ground water percolating through limestone. The Florida Legislature designated agatized coral as the Florida State Stone in 1979. The statute describes it as “a chalcedony pseudomorph after coral, appearing as limestone geodes lined with botryoidal agate or quartz crystals and drusy quartz fingers, indigenous to Florida." Agatized coral occurs in a variety of colors, typically gray, brown, black, yellow, white, and on rare occasion red. The majority of Florida’s agatized coral formed in Oligocene-Miocene Hawthorn Group sediments. Fossil agatized coral is occasionally dredged up in the Tampa and Clearwater areas but also occurs in limestones along the Econfina, Withlachoochee and Suwannee Rivers.
Fossil corals were simple marine invertebrates that possessed a sac-like body called a polyp with a mouth and tentacles. As carnivores, they would immobilize or kill their prey with their stinging tentacles then swallow their prey and later expel the wastes through the same mouth. They formed a dense outer skeleton of calcium carbonate which, when living in large colonies of thousands of cloned individuals, formed a massive structure. The complex folds in their stomach cavity can be seen in the wondrous detail left behind in their skeletons. Modern corals today share a symbiotic relationship with algae that covers their body tissue. The algae supplement the coral with oxygen which most likely was the case in prehistoric times, as well.
Prehistoric corals are believed to have thrived in the same environments that modern corals prefer - clean, warm oceans of normal salinity levels. Solitary corals were present in oceans of soft, muddy bottoms while horn corals and colonial corals preferred hard sea floors to attach themselves.