Fluorine

Fluorine is found in the Earth's crust, 0.065 % (w/w) [4], in:

• Fluorite/fluorspar, CaF₂ [3]
• Fluoroapatite, Ca₅(PO₄)₃F [3]
• Cryolite, Na₃AlF₆ [3]
• Sea water (7 · 10⁻⁵ M) [3]
• Teeth, bone and blood (small amounts) [3]

The isotope found in nature is ¹⁹F (100%, stable) [4].