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Johnbaumite

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John Leach Baum
Formula:
Ca5(AsO4)3OH
System:
Hexagonal
Colour:
Light grayish white
Hardness:
Name:
Named by Pete Dunn, Donald Peacor, and N. Newberry in 1980 in honor of Mr. John Leach Baum [March 15, 1916 New York, New York, USA - October 16, 2011 Hamburg, New Jersey, USA], graduate of Harvard University and student under Dr. Charles Palache. He was the former Head Geologist, Franklin Mine, Curator Emeritus of the Franklin Mineral Museum, author and contributor to the mineralogy and geology of the Franklin deposit.
Apatite Group. The arsenate analogue of Hydroxylapatite.

Classification of Johnbaumite

Approved 1980
8.BN.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1
41.8.3.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
20.2.6

20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
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First Recorded Occurrence of Johnbaumite

General Appearance of First Recorded Material:
Grayish white masses
Year of Discovery:
1980
Geological Setting of First Recorded Material:
Metamorphic zinc-bearing skarn

Occurrences of Johnbaumite

Geological Setting:
Skarn

Physical Properties of Johnbaumite

Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Light grayish white
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Distinct/Good
{10-10}
Fracture:
Irregular/Uneven
Density:
3.68 g/cm3 (Measured)    3.73 g/cm3 (Calculated)

Crystallography of Johnbaumite

Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Space Group Setting:
P63/m
Cell Parameters:
a = 9.7Å, c = 6.93Å
Ratio:
a:c = 1 : 0.714
Unit Cell Volume:
V 564.69 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.98 (50)
3.47 (50)
2.90 (100)
2.82 (70)
2.80 (70)
2.68 (50)
2.03 (40)
1.879 (40)
Comments:
ICDD 33-265

Optical Data of Johnbaumite

Type:
Uniaxial (-)
RI values:
nω = 1.687 nε = 1.684
Birefringence:
0.003
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic

Chemical Properties of Johnbaumite

Formula:
Ca5(AsO4)3OH
Essential elements:
All elements listed in formula:

Relationship of Johnbaumite to other Species

Other Members of Group:
AlforsiteBa5(PO4)3Cl
BellitePb5 (AsO4,CrO4, SiO2)3Cl
Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
ChlorapatiteCa5(PO4)3Cl
FluorapatiteCa2Ca3(PO4)3F
HydroxylapatiteCa5(PO4)3(OH)
Hydroxylapatite-MCa5(PO4)3OH
HydroxylpyromorphitePb5(PO4)3(OH)
Johnbaumite-MCa5(AsO4)3OH
Manganapatite
MimetitePb5(AsO4)3Cl
Mimetite-2M
Miyahisaite(Sr,Ca)2Ba3(PO4)3F
Mn-bearing Fluorapatite(Ca,Mn2+)5(PO4)3(F,Cl,OH) or Ca5([P,Mn5+]O4)3(F,Cl,OH)
OxypyromorphitePb10(PO4)6O
PieczkaiteMn5(PO4)3Cl
PyromorphitePb5(PO4)3Cl
StronadelphiteSr5(PO4)3F
SvabiteCa5(AsO4)3F
TurneaureiteCa5(AsO4)3Cl
Unnamed (F-analogue of Pyromorphite)Pb5(PO4)3F
Unnamed (OH-analogue of Mimetite)Pb5(AsO4)3(OH)
VanadinitePb5(VO4)3Cl
Common Associates:
8.BN.05AlforsiteBa5(PO4)3Cl
8.BN.05Belovite-(Ce)NaCeSr3(PO4)3F
8.BN.05Carbonate-rich FluorapatiteCa5(PO4,CO3)3(F,O)
8.BN.05Carbonate-rich HydroxylapatiteCa5(PO4,CO3)3(OH,O)
8.BN.05ChlorapatiteCa5(PO4)3Cl
8.BN.05Mimetite-MPb5(AsO4)3Cl
8.BN.05Johnbaumite-MCa5(AsO4)3OH
8.BN.05FluorapatiteCa2Ca3(PO4)3F
8.BN.05HedyphanePb3Ca2(AsO4)3Cl
8.BN.05HydroxylapatiteCa5(PO4)3(OH)
8.BN.05MimetitePb5(AsO4)3Cl
8.BN.05MorelanditeCa2Ba3(AsO4)3Cl
8.BN.05PyromorphitePb5(PO4)3Cl
8.BN.05FluorstrophiteSrCaSr3(PO4)3F
8.BN.05SvabiteCa5(AsO4)3F
8.BN.05TurneaureiteCa5(AsO4)3Cl
8.BN.05VanadinitePb5(VO4)3Cl
8.BN.05Belovite-(La)NaLaSr3(PO4)3F
8.BN.05Deloneite(Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5
8.BN.05FluorcaphiteSrCaCa3(PO4)3F
8.BN.05Kuannersuite-(Ce)NaCeBa3(PO4)3F0.5Cl0.5
8.BN.05Hydroxylapatite-MCa5(PO4)3OH
8.BN.05PhosphohedyphaneCa2Pb3(PO4)3Cl
8.BN.05StronadelphiteSr5(PO4)3F
8.BN.05FluorphosphohedyphaneCa2Pb3(PO4)3F
8.BN.05Carlgieseckeite-(Nd)NaNdCa3(PO4)3F
8.BN.05Miyahisaite(Sr,Ca)2Ba3(PO4)3F
8.BN.10ArctiteNa2Ca4(PO4)3F
20.2.1BearsiteBe2(AsO4)(OH) · 4H2O
20.2.2BrassiteMg(HAsO4) · 4H2O
20.2.3RössleriteMg(HAsO4) · 7H2O
20.2.4HörnesiteMg3(AsO4)2 · 8H2O
20.2.5WeiliteCa(HAsO4)
20.2.7HaidingeriteCaHAsO4 · H2O
20.2.8PharmacoliteCa(HAsO4) · 2H2O
20.2.9SainfelditeCaCa2Ca2(AsO4)2(HAsO4)2 · 4H2O
20.2.10VladimiriteCa4(AsO4)2(AsO3OH) · 4H2O
20.2.11GuériniteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.12FerrarisiteCa5(AsO4)2(HAsO4)2 · 9H2O
20.2.13RauenthaliteCa3(AsO4)2 · 10H2O
20.2.14PhaunouxiteCa3(AsO4)2 · 11H2O
20.2.15McneariteNaCa5(AsO4)(HAsO4)4 · 4H2O
20.2.16BergslagiteCaBeAsO4(OH)
20.2.17AdeliteCaMg(AsO4)(OH)
20.2.18TalmessiteCa2Mg(AsO4)2 · 2H2O
20.2.19IrhtemiteCa4Mg(AsO4)2(HAsO4)2 · 4H2O
20.2.20CamgasiteCaMg(AsO4)(OH) · 5H2O
20.2.21PicropharmacoliteCa4Mg(AsO4)2(HAsO4)2 · 11H2O
20.2.22BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O

Other Names for Johnbaumite

Name in Other Languages:
German:Johnbaumit
Spanish:Johnbaumita

Other Information

Pinkish orange in SW only
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Johnbaumite

Reference List:
American Mineralogist (1980): 65: 1143-1145.

Young J. Lee, Peter W. Stephens, Yuanzhi Tang, Wei Li, Brian L. Phillips, John B. Parise, and Richard J. Reeder (2009): Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1–xO4)3OH solid solution. American Mineralogist 94, 666-675.

Internet Links for Johnbaumite

Localities for Johnbaumite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Japan
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Takahashi City
          • Bicchu-cho (Bitchu-cho)
            • Fuka
American Mineralogist (1999): 84:991.; Journal of Mineralogical and Petrological Sciences Vol. 99 (2004) , No. 2 April 67-71
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Buriatia Republic (Buryatia)
        • Vitim Plateau
P.M. Kartashov data; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
Sweden
 
  • Värmland
    • Filipstad
      • Nordmark (Nordmarksberg)
No reference listed
Mineralogical Magazine (1998) 62 (3), 395-407
      • Persberg district
        • Pajsberg
Biagioni, C. & Pasero, M. (2013): The crystal structure of johnbaumite, Ca5(AsO4)3OH, the arsenate analogue of hydroxylapatite. American Mineralogist. 98, 1580–1584
USA
 
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
Dunn, P.J., et al: Am.Min.:65:1143-1145 (1980); Dunn(1995):Pt5:651.
        • Ogdensburg
          • Sterling Hill
Jenkins, R.E., II: (1994); Dunn(1995):Pt5:651.
Mineral and/or Locality  
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