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- Apatite abstract "Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, named for high concentrations of OH−, F− and Cl− ions, respectively, in the crystal. The formula of the admixture of the four most common endmembers is written as Ca10(PO4)6(OH,F,Cl)2, and the crystal unit cell formulae of the individual minerals are written as Ca10(PO4)6(OH)2, Ca10(PO4)6(F)2 and Ca10(PO4)6(Cl)2.Apatite is one of a few minerals produced and used by biological micro-environmental systems. Apatite is the defining mineral for 5 on the Mohs scale. Hydroxyapatite, also known as hydroxylapatite, is the major component of tooth enamel and bone mineral. A relatively rare form of apatite in which most of the OH groups are absent and containing many carbonate and acid phosphate substitutions is a large component of bone material.Fluorapatite (or fluoroapatite) is more resistant to acid attack than is hydroxyapatite; in the mid-20th century, it was discovered that communities whose water supply naturally contained fluorine had lower rates of dental caries. Fluoridated water allows exchange in the teeth of fluoride ions for hydroxyl groups in apatite. Similarly, toothpaste typically contains a source of fluoride anions (e.g. sodium fluoride, sodium monofluorophosphate). Too much fluoride results in dental fluorosis and/or skeletal fluorosis.Fission tracks in apatite are commonly used to determine the thermal history of orogenic (mountain) belts and of sediments in sedimentary basins. (U-Th)/He dating of apatite is also well established for use in determining thermal histories and other, less typical applications such as paleo-wildfire dating.Phosphorite is a phosphate-rich sedimentary rock, that contains between 18% and 40% P2O5. The apatite in phosphorite is present as cryptocrystalline masses referred to as collophane.".
- Apatite colour Transparency_and_translucency.
- Apatite thumbnail Apatite_crystals.jpg?width=300.
- Apatite wikiPageID "140627".
- Apatite wikiPageRevisionID "603660622".
- Apatite birefringence "0.002".
- Apatite category Phosphate_minerals.
- Apatite cleavage "[0001] indistinct, [1010] indistinct".
- Apatite color "Transparent to translucent, usually green, less often colorless, yellow, blue to violet, pink, brown.".
- Apatite diaphaneity "Transparent to translucent".
- Apatite dispersion "0.013".
- Apatite 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.".
- Apatite formula "Ca53".
- Apatite fracture "Conchoidal to uneven".
- Apatite gravity "3.16".
- Apatite habit "Tabular, prismatic crystals, massive, compact or granular".
- Apatite hasPhotoCollection Apatite.
- Apatite luster "Vitreous to subresinous".
- Apatite mohs "5".
- Apatite name "Apatite group".
- Apatite opticalprop "Double refractive, uniaxial negative".
- Apatite pleochroism "Blue stones – strong, blue and yellow to colorless. Other colors are weak to very weak.".
- Apatite polish "Vitreous".
- Apatite refractive "1.634".
- Apatite streak "White".
- Apatite strunz "8".
- Apatite system "Hexagonal dipyramidal".
- Apatite wordnet_type synset-mineral-noun-1.
- Apatite subject Category:Calcium_minerals.
- Apatite subject Category:Gemstones.
- Apatite subject Category:Hexagonal_minerals.
- Apatite subject Category:Phosphate_minerals.
- Apatite subject Category:Piezoelectric_materials.
- Apatite type ChemicalSubstance.
- Apatite type Mineral.
- Apatite type ChemicalObject.
- Apatite type Thing.
- Apatite comment "Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite and chlorapatite, named for high concentrations of OH−, F− and Cl− ions, respectively, in the crystal.".
- Apatite label "Apatiet".
- Apatite label "Apatit".
- Apatite label "Apatita".
- Apatite label "Apatita".
- Apatite label "Apatite".
- Apatite label "Apatite".
- Apatite label "Apatite".
- Apatite label "Apatyt".
- Apatite label "Апатит".
- Apatite label "أباتيت".
- Apatite label "燐灰石".
- Apatite label "磷灰石".
- Apatite sameAs Apatit.
- Apatite sameAs Apatit.
- Apatite sameAs Απατίτης.
- Apatite sameAs Apatita.
- Apatite sameAs Apatito.
- Apatite sameAs Apatite.
- Apatite sameAs Apatite.
- Apatite sameAs 燐灰石.
- Apatite sameAs 인회석.
- Apatite sameAs Apatiet.
- Apatite sameAs Apatyt.
- Apatite sameAs Apatita.
- Apatite sameAs m.011k2s.
- Apatite sameAs Q178397.
- Apatite sameAs Q178397.
- Apatite wasDerivedFrom Apatite?oldid=603660622.
- Apatite depiction Apatite_crystals.jpg.
- Apatite isPrimaryTopicOf Apatite.
- Apatite name "Apatite group".