Apatite

Formula: Ca₁₀(PO₄)₆(OH,F,Cl)₂

Mohs scale hardness: 5-5,5Specific gravity: 3.2–3.4 g/cm³

^{Rare earth elements: La}

^{Rare earth content REO, %: 12}

Other constituents, %: strontium, thorium, uranium, radium, lead-210, polonium-210, radon

Mineralklasse: Phosphate

Uses: as a source of phosphorus to be used in fertilizer, rarely as a gemstone and as a mineral specimen.

References

1. https://en.wikipedia.org

2. http://stonecontract.eu

3. https://en.wikipedia.org/wiki/Apatite

4. http://www.galleries.com/Apatite