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| Apatite from Russia, Ural Mountains |
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Apatite en.wikipedia.org Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, and chlorapatite, named for high concentrations of OH-, F-, or Cl- ions, respectively, in the crystal. The formula of the admixture of the three most common species is written as Ca5(PO4)3(OH, F, Cl), and the formulae of the individual minerals are written as Ca5(PO4)3(OH), Ca5(PO4)3F and Ca5(PO4)3Cl, respectively. Apatite is one of few minerals that are produced and used by biological systems. Hydroxylapatite is the major component of tooth enamel, and a large component of bone material. http://www.agu.org Apatite fission track samples were collected from the ultrahigh-pressure (UHP) Maksyutov Complex, south Ural Mountains, in the footwall of the Main Uralian fault (MUF) to constrain the low-temperature cooling history and to establish the late stage exhumation rate for the complex. Fission track samples were taken along a 70-km north-south transect and a 5-km east-west traverse through the Maksyutov Complex, with two samples from the hanging wall of the MUF. http://www.galleries.com The Apatite Group minerals are a group of phosphates, arsenates and vanadates that have very similar hexagonal or pseudohexagonal monoclinic structures. This group includes several important and colorful minerals such as apatite (from where this group gets its name), mimetite, pyromorphite and vanadinite; all pictured above. Apatite is a general name for three official minerals named chlorapatite, fluorapatite and hydroxylapatite. |
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