This is a fine example of Florida agatized rock. This is a rare form of chalcedony native to Florida's fossil deposits. Amongst the fossiliferous limestone deposits in the Bone Valley region of Florida, mineral-rich groundwater seeps into the rock and forms these chalcedony crystals. This often results in beautiful agatized fossil and coral specimens. It also results in these scarcely-seen masses of macro crystals attached to limestone matrix rock. The example offered here was found in the Peace River (Bone Valley, Hardee County, FL) while hunting for fossils. When wet, it has a deep greenish-brown hue to it and it looks greenish-white when dry (like in the photos). This specimen was found in a deposit consisting of fossiliferous limestone from the Eocene-Miocene period.
Refer to the photos. The black centimeter cube is shown for scale and is not included. You are purchasing the specimen shown. It measures approx. 2.5 inches x 2.75 inches x 1.75 inches (63mm x 70mm x 44mm). Your purchase will include an ID label.