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Monday, December 8, 2008

Blue Apatite

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 endmembers 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 micro-environmental systems. Apatite has a Moh's Scale hardness of 5. Hydroxylapatite is the major component of tooth enamel. 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.

This blue facetted apatite I got recently is meant as a collectors item and not really meant for wearing!

Look at that intense blue!

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