Apatite is a mineral with a variable content of fluorine, chlorine and OH ions. It has varieties of chlorine-apatite, fluorine-apatite and carbonate-apatite. Due to the variable composition, the common name "apatite" is the name of a supergroup of apatite. In addition to inorganic formation, apatite is also a biomineral, because it occurs in the form of microcrystals in the bones and teeth of living organisms. Apatite is called "bread stone", because. mined for the production of fertilizers.
You can see apatite stone for sale and buy it in the Minerals of Russia online store.
|Crystal class||Dipyramidal (6/m) (same H-M symbol)|
|Space group||P63/m (no. 176)|
|Color||Transparent to translucent, usually green, less often colorless, yellow, blue to violet, pink, brown.|
|Crystal habit||Tabular, prismatic crystals, massive, compact or granular|
|Cleavage|| indistinct,  indistinct|
|Fracture||Conchoidal to uneven|
|Mohs scale hardness||5(defining mineral)|
|Luster||Vitreous to subresinous|
|Diaphaneity||Transparent to translucent|
|Optical properties||Double refractive, uniaxial negative|
|Refractive index||1.634–1.638 (+0.012, −0.006)|
|Pleochroism||Blue stones – strong, blue and yellow to colorless. Other colors are weak to very weak.|
|Ultraviolet fluorescence||Yellow stones – purplish-pink, which is stronger in long wave; blue stones – blue to light-blue in both long and short wave; green stones – greenish-yellow, which is stronger in long wave; violet stones – greenish-yellow in long wave, light-purple in short wave.|