Johnbaumite Mineral Data

General Johnbaumite Information

Chemical Formula:

Ca5(AsO4)3(OH)

Composition:

Molecular Weight = 634.15 gm

Calcium 31.60 % Ca 44.21 % CaO

Arsenic 35.44 % As 54.37 % As₂O₅

Hydrogen 0.16 % H 1.42 % H₂O

Oxygen 32.80 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₅(AsO₄)₃(OH)

Environment:

As analog of hydroxylapatite and (OH) analog of svabite.

IMA Status:

Approved IMA 1980

Locality:

Palmer Shaft, Franklin mine, Franklin, Sussex County, New Jersey, USA. Link to MinDat.org Location Data.

Name Origin:

Named for John L. Baum (1916-), resident geologist of the New Jersey Zinc Co. and curator of the Franklin Mineral Museum, Franklin, New Jersey, USA.

Name Pronunciation:

Johnbaumite + Pronunciation

Johnbaumite Image

Images:

Johnbaumite Tephroite

Comments: Violet crystalline massive johnbaumite with brown tephroite.
Location: Jacobsberg, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Johnbaumite Crystallography

Axial Ratios:

a:c = 1:0.71443

Cell Dimensions:

a = 9.7, c = 6.93, Z = 2; V = 564.69 Den(Calc)= 3.73

Crystal System:

Hexagonal Space Group: P 6₃/m,P 6₃

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

By Intensity(I/I_o): 2.895(1), 2.798(0.7), 2.82(0.7),

Physical Properties of Johnbaumite

Cleavage:

{1010} Distinct

Color:

Colorless, White.

Density:

3.65

Diaphaneity:

Transparent

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Fluorescent, Short UV=pink orange.

Luster:

Vitreous - Greasy

Streak:

white

Optical Properties of Johnbaumite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Gladstone-Dale:

CI meas= -0.011 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1838,KPDmeas= 0.1878,KC= 0.1858
Ncalc = 1.68 - 1.69

Optical Data:

Uniaxial (-), e=1.684, w=1.687, bire=0.0030.

Calculated Properties of Johnbaumite

Electron Density:

Bulk Density (Electron Density)=3.58 gm/cc
note: Specific Gravity of Johnbaumite =3.73 gm/cc.

Fermion Index:

Fermion Index = 0.0005842641
Boson Index = 0.9994157359

Photoelectric:

PE_Johnbaumite= 27.96 barns/electron
U=PE_Johnbaumite x rElectron Density= 100.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Johnbaumite is Not Radioactive

Johnbaumite Classification

Dana Class:

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

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

(41.08.03)Svabite Group

41.08.03.01 Svabite Ca5(AsO4)3F P 6₃/m 6/m

41.08.03.02 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

41.08.03.03 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

41.08.03.04 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

Strunz Class:

08.BN.05 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BN -With only large cations, (OH, etc.):RO4 = 0.33:1

08.BN.05 Alforsite Ba5(PO4)3Cl P 6₃/m 6/m

08.BN.05 Apatite* Ca5(PO4)3(OH,F,Cl) P 6₃/m 6/m

08.BN.05 Belovite-(Ce) (Sr,Ce,Na,Ca)5(PO4)3(OH) P 3 3

08.BN.05 Belovite-(La)! (Sr,La,Ce,Ca)5(PO4)3(F,OH) P 3 3

08.BN.05 Fermorite (Ca,Sr)5(AsO4,PO4)3(OH) P 6₃/m 6/m

08.BN.05 Deloneite-(Ce)! NaCa2SrCe(PO4)3F P 3 3

08.BN.05 Johnbaumite Ca5(AsO4)3(OH) P 6₃/m,P 6₃ Hex

08.BN.05 Apatite-(CaOH) Ca5(PO4)3(OH) P 6₃/m 6/m

08.BN.05 Apatite-(CaCl) Ca5(PO4)3Cl P 6₃/m 6/m

08.BN.05 Carbonate-fluorapatite? Ca5(PO4,CO3)3F P 6₃/m 6/m

08.BN.05 Carbonate-hydroxylapatite? Ca5(PO4,CO3)3(OH) P 6₃/m 6/m

08.BN.05 Clinomimetite Pb5(AsO4)3Cl P 2₁/b 2/m

08.BN.05 Apatite-(CaF) Ca5(PO4)3F P 6₃/m 6/m

08.BN.05 Fluorcaphite! (Ca,Sr,Ce,Na)5(PO4)3F P 6₃ 6

08.BN.05 Hedyphane Ca2Pb3(AsO4)3Cl P 6₃/m 6/m

08.BN.05 Mimetite Pb5(AsO4)3Cl P 6₃/m 6/m

08.BN.05 Apatite-(SrOH) (Sr,Ca)5(PO4)3(F,OH) P 6₃/m 6/m

08.BN.05 Morelandite (Ba,Ca,Pb)5(AsO4,PO4)3Cl P 6₃/m,P 6₃ Hex

08.BN.05 Pyromorphite Pb5(PO4)3Cl P 6₃/m 6/m

08.BN.05 Vanadinite Pb5(VO4)3Cl P 6₃/m 6/m

08.BN.05 Apatite-(CaOH)-M! (Ca,Na)5[(P,S)O4]3(OH,Cl) P 2₁/b 2/m

08.BN.05 IMA2008-068! Ca2Pb3(PO4)3F P 6₃/m 6/m

08.BN.05 Svabite Ca5(AsO4)3F P 6₃/m 6/m

08.BN.05 Kuannersuite-(Ce)! Ba6Na2REE2(PO4)6FCl P 3 3

08.BN.05 Turneaureite Ca5[(As,P)O4]3Cl P 6₃/m 6/m

08.BN.05 Phosphohedyphane! Ca2Pb3(PO4)3Cl P 6₃/m 6/m

08.BN.05 IMA2008-009! Sr5(PO4)3F P 6₃/m 6/m 2/m 2/m

08.BN.05 Hydroxylpyromorphite! Pb5(PO4)3OH P 6₃/m 6/m

Other Johnbaumite Information

References:

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

See Also:

Links to other databases for Johnbaumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Franklin Minerals(Dunn)
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info

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Print or Cut-and-Paste your Johnbaumite Specimen Label here :

Johnbaumite

Ca5(AsO4)3(OH)
Dana No: 41.08.03.03 Strunz No: 08.BN.05
Locality:

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