7" Illinois Fluorite Cluster a78605ff5efeeee5879cb1ad50d4dfd8 (about 20 to 180 million

(about 20 to 180 million years ago)

Whereas most Crinoids either root themselves or are free floating

which gives it the green hue

and iron plus vanadium results in orange stones

long before dinosaurs existed but went extinct around 250 mya

7" Illinois Fluorite Cluster a78605ff5efeeee5879cb1ad50d4dfd8 (about 20 to 180 millionFluorite is the "State Mineral" of Illinois. Fluorite forms in a variety of colors and is transparent to translucent in clarity. The chemical composition of Fluorite is CaF2, (calcium & fluorine.) The variation in colors are due to trace amounts of other elements replacing the calcium during the crystalline formation. Fluorite is used in a variety of industrial purposes and the overwhelming percentage of Fluorite in the United States was mined in