Hydroxyapatite
Videos
Hydroxyapatite is a naturally occurring mineral form of apatite with the formula Ca53, often written Ca1062 to denote that the crystal unit cell comprises two entities. It is the hydroxyl endmember of
Hydroxyapatite crystal
Hydroxyapatite crystals on matrix
Needle-like hydroxyapatite crystals on stainless steel. Scanning electron microscope picture from University of Tartu.
Fluorapatite
Videos
Fluorapatite, often with the alternate spelling of fluoroapatite, is a phosphate mineral with the formula Ca53F. Fluorapatite is a hard crystalline solid. Although samples can have various colors, the
Hydroxyapatite
…cell comprises two entities. It is the hydroxyl endmember of the complex apatite group. The OH− ion can be replaced by fluoride or chloride, producing fluorapatite or chlorapatite. It crystallizes in the hexagonal crystal system. Pure hydroxyapatite powder is white. Naturally occurring apatites can, however, also…
Fluorapatite (pink) on top of muscovite (green)
Fluorapatite grains in carbonate groundmass. Photomicrographs of thin section from Siilinjärvi apatite ore.
Fluorapatite. São Geraldo do Baixio, Doce valley, Minas Gerais, Brazil.