Chlorapatite Mineral Data

Chlorapatite Mineral Data

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General Chlorapatite Information

Chemical Formula:

Ca5(PO4)3Cl

Composition:

Molecular Weight = 520.76 gm

Calcium 38.48 % Ca 53.84 % CaO

Phosphorus 17.84 % P 40.89 % P₂O₅

Chlorine 6.81 % Cl 6.81 % Cl

- % Cl -1.54 % -O=Cl₂

Oxygen 36.87 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(PO₄)₃Cl

Environment:

Calc-silicate rocks.

IMA Status:

Valid Species (Pre-IMA) 1860

Locality:

Bob's Lake, Oso Twp., Frontenac County, Canada. Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

Apatite

ICSD 1706

PDF 33-271

Chlorapatite Image

Images:

Chlorapatite

Comments: Blocky crystals of chlorapatite.
Location: Oyna, Froland, Norway. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Chlorapatite Crystallography

Axial Ratios:

a:c = 1:0.70598

Cell Dimensions:

a = 9.598, c = 6.776, Z = 2; V = 540.59 Den(Calc)= 3.20

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): 2.779(1), 2.861(0.6), 1.836(0.2),

Forms:

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Forms: [ 1 1 2] [ 0 1 0] [ 0 0 1]

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Crystal Structure:

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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: Kragero, Norway

View Additional jPOWD Structure files for Chlorapatite
[1] [2] [3] [4] [5]

Physical Properties of Chlorapatite

Cleavage:

[0001] Indistinct

Color:

White, Light yellow, Pink white.

Density:

3.1 - 3.2, Average = 3.15

Diaphaniety:

Transparent to Translucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

5 - Apatite

Luminescence:

Fluorescent.

Luster:

Vitreous - Dull

Streak:

white

Optical Properties of Chlorapatite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.002 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2098,KPDmeas= 0.2131,KC= 0.2094

Optical Data:

Uniaxial (-), e=1.6675, w=1.675, bire=0.0075.

Calculated Properties of Chlorapatite

Electron Density:

r_electron=3.17 gm/cc
note: r_Chlorapatite=3.20 gm/cc.

Fermion Index

Fermion Index = 0.00069
Boson Index = 0.99931

Photoelectric:

PE_Chlorapatite= 6.03 barns/electron
U=PE_Chlorapatite x r_electron= 19.13 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chlorapatite is Not Radioactive

Chlorapatite Classification

Dana Class:

41.8.1.2 (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.39-20 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 Chlorapatite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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Chlorapatite

Ca5(PO4)3Cl
Dana No: 41.8.1.2 Strunz No: VII/B.39-20
Locality:

Notes: