Fluorite Hummingbird on Pink Tourmaline 3b34b75217acce59401b324780a0e611 Trilobites are are important as

Trilobites are are important as paleo-zoic guide fossils

Chelicerata

the Left & Right Pleural Lobes and the middle Axial Lobe

such as quartz) during a process called permineralization / replacement

Not to be confused with "Cubic zirconia

Fluorite Hummingbird on Pink Tourmaline 3b34b75217acce59401b324780a0e611 Trilobites are are important asFluorite 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