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:

HexagonalSpace 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

Search for Johnbaumite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Johnbaumite :

A Bijoux Google Search for Johnbaumite
Adam's Minerals Google Search for Johnbaumite
Cape Minerals Google Search for Johnbaumite
Dakota Matrix Minerals Google Search for Johnbaumite
Excalibur Mineral Corp. Google Search for Johnbaumite
Exceptional Minerals Google Search for Johnbaumite
John Betts Fine Minerals Search for Johnbaumite
McDougall Minerals Google Search for Johnbaumite
Mineral News Website Link
Rock and Mineral Shows Google Search for Johnbaumite
Weinrich Minerals, Inc. Google Search for Johnbaumite

Ask about Johnbaumite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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:

Notes: