Apatite is a group of phosphate minerals, usually referring to hydroxylapatite, fluorapatite, chlorapatite and bromapatite, named for high concentrations of OH−, F−, Cl− or Br−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,Br)2, and the crystal unit cell formulae of the individual minerals are written as Ca10(PO4)6(OH)2, Ca10(PO4)6(F)2, Ca10(PO4)6(Cl)2 and Ca10(PO4)6(Br)2.
Apatite is one of a few minerals that are 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. For this reason, toothpaste typically contains a source of fluoride anions (e.g. sodium fluoride, sodium monofluorophosphate). Similarly, fluoridated water allows exchange in the teeth of fluoride ions for hydroxyl groups in apatite. Too much fluoride results in dental fluorosis and/or skeletal fluorosis.
Blue Apatite - Lets Talk Stones
【雪歌ユフ×海歌シン】APATITE【オリジナル曲】
【Yokune Ruko×Rook】 APATITE 【UTAUカバー】
【UTAUカバー】APATITE【Hibiki Shinji・Ryone Yami】
「apatite」歌ってみた。【イナカモノ】
[Nayuta] apatite
Discovering Apatite at Green Mantle Farms
【YuKaiLoid 03 VB RELEASE】 - 【MEGAne & KUBI SHUNE】 - APATITE - 【UTAU】
[RIN/KAITO APPEND] APATITE [VOCALOID3]
Apatite 26.06cts
Apatite
Apatite
FTB Tutorials - Apatite Ore
♫ 【初音ミクDark / Hatsune Miku】apatite【オリジナル】 ♫
Blue Apatite - Lets Talk Stones
【雪歌ユフ×海歌シン】APATITE【オリジナル曲】
【Yokune Ruko×Rook】 APATITE 【UTAUカバー】
【UTAUカバー】APATITE【Hibiki Shinji・Ryone Yami】
「apatite」歌ってみた。【イナカモノ】
[Nayuta] apatite
Discovering Apatite at Green Mantle Farms
【YuKaiLoid 03 VB RELEASE】 - 【MEGAne & KUBI SHUNE】 - APATITE - 【UTAU】
[RIN/KAITO APPEND] APATITE [VOCALOID3]
Apatite 26.06cts
Apatite
Apatite
FTB Tutorials - Apatite Ore
♫ 【初音ミクDark / Hatsune Miku】apatite【オリジナル】 ♫
[UTAU] APATITE 「粗野音ミリ・マイロ」
Minecraft FTB - Ep. 3 - Apatite!
Lateral augmentation- using Bond Apatite
【UTAU】APATITE 【HARMON-E ・ Amare Arco】 +UST
Healing properties of Apatite Crystal & Aquamarine Crystal
【UTAUカバー】 APATITE 【Namine Ritsu and Yokune Ruko ♂ Kire】
Apatite - Inakamono
Green Apatite Crystals - Physical Body Healing & Trauma Treatment (May 15, 2012)
Motivation with Apatite