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 % As2 O5
Hydrogen 0.16 % H 1.42 % H2 O
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 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
X Ray Diffraction:
By Intensity(I/Io ): 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:
PEJohnbaumite = 27.96 barns/electronU=PEJohnbaumite x r Electron 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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Johnbaumite
Ca5(AsO4)3(OH)
Dana No: 41.08.03.03 Strunz No: 08.BN.05
Locality:
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