Hydroxylapatite Mineral Data

Hydroxylapatite Mineral Data +

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General Hydroxylapatite Information

Chemical Formula:

Ca5(PO4)3(OH)

Composition:

Molecular Weight = 502.31 gm

Calcium 39.89 % Ca 55.82 % CaO

Phosphorus 18.50 % P 42.39 % P₂O₅

Hydrogen 0.20 % H 1.79 % H₂O

Oxygen 41.41 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(PO₄)₃(OH)

IMA Status:

Valid Species (Pre-IMA) 1856

Locality:

Holly Springs, Cherokee County, Georgia, USA. Link to MinDat.org Location Data.

Name Origin:

Named as the hydroxyl end-member and from the Greek apatao - "I am misleading."

Synonym:

Apatite

Deltaite-mixture with crandellite

Hydroxy Apatite

ICSD 203027

PDF 9-432

Hydroxylapatite Image

Images:

Hydroxylapatite

Comments: Opaque white blocky crystal of hydroxylapatite.
Location: Snarum, Buskerud, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Hydroxylapatite Crystallography

Axial Ratios:

a:c = 1:0.72998

Cell Dimensions:

a = 9.418, c = 6.875, Z = 2; V = 528.11 Den(Calc)= 3.16

Crystal System:

Hexagonal - DipyramidalH-M Symbol (6/m) Space Group: P 6₃/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.814(1), 2.72(0.6), 2.778(0.6),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
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Hughes J M , Cameron M , Crowley K D , American Mineralogist , 74 (1989) p.870-876, Structural variations in natural F, OH, and Cl apatites, Locality: Holly Springs, Georgia, USA

View Additional jPOWD Structure files for Hydroxylapatite
[1] [3] [4] [5] [6] [7]

Physical Properties of Hydroxylapatite

Cleavage:

[???] Indistinct

Color:

Colorless, White, Gray, Yellow, Yellowish green.

Density:

3.08

Diaphaniety:

Transparent to Opaque

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

5 - Apatite

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Hydroxylapatite

Gladstone-Dale:

CI meas= -0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2049,KPDmeas= 0.2102,KC= 0.2009

Optical Data:

Uniaxial (-), e=1.644, w=1.651, bire=0.0070.

Calculated Properties of Hydroxylapatite

Electron Density:

r_electron=3.15 gm/cc
note: r_{Hydroxylapatite}=3.16 gm/cc.

Fermion Index

Fermion Index = 0.00073
Boson Index = 0.99927

Photoelectric:

PE_{Hydroxylapatite}= 5.78 barns/electron
U=PE_{Hydroxylapatite} x r_electron= 18.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Hydroxylapatite is Not Radioactive

Hydroxylapatite Classification

Dana Class:

41.8.1.3 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.8)where (A)5 (XO4)3 Zq

(41.8.1)Dana Group

41.8.1.0 Apatite* Ca5(PO4)3(OH,F,Cl) P 6₃/m 6/m

41.8.1.1 Fluorapatite Ca5(PO4)3F P 6₃/m 6/m

41.8.1.2 Chlorapatite Ca5(PO4)3Cl P 6₃/m 6/m

41.8.1.3 Hydroxylapatite Ca5(PO4)3(OH) P 6₃/m 6/m

41.8.1.4 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 6₃/m 6/m

41.8.1.5 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

41.8.1.6 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

41.8.1.6a Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

41.8.1.6b Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

41.8.1.7 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

41.8.1.8 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

41.8.1.9 Deloneite-(Ce)! NaCa2SrCe(PO4)3F P 3 3

Strunz Class:

VII/B.39-30 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.39 - Apatite - Pyromorphite group

VII/B.39-10 Fluorapatite Ca5(PO4)3F P 6₃/m 6/m

VII/B.39-20 Chlorapatite Ca5(PO4)3Cl P 6₃/m 6/m

VII/B.39-30 Hydroxylapatite Ca5(PO4)3(OH) P 6₃/m 6/m

VII/B.39-40 Carbonate-hydroxylapatite Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

VII/B.39-50 Carbonate-fluorapatite Ca5(PO4,CO3)3F P 6₃/m 6/m

VII/B.39-60 Svabite Ca5(AsO4)3F P 6₃/m 6/m

VII/B.39-70 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

VII/B.39-80 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

VII/B.39-90 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

VII/B.39-95 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

VII/B.39-100 Strontium-apatite (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

VII/B.39-110 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

VII/B.39-115 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

VII/B.39-117 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

VII/B.39-120 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

VII/B.39-130 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

VII/B.39-140 Hedyphane Ca2Pb3(AsO4)3Cl P 6₃/m 6/m

VII/B.39-150 Pyromorphite Pb5(PO4)3Cl P 6₃/m 6/m

VII/B.39-160 Mimetite Pb5(AsO4)3Cl P 6₃/m 6/m

VII/B.39-165 Clinomimetite Pb5(AsO4)3Cl P 2₁/b 2/m

VII/B.39-170 Vanadinite Pb5(VO4)3Cl P 6₃/m 6/m

Other Hydroxylapatite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Hydroxylapatite

Ca5(PO4)3(OH)
Dana No: 41.8.1.3 Strunz No: VII/B.39-30
Locality:

Notes: