Johnbaumite
A valid IMA mineral species
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About Johnbaumite
John Leach Baum
Formula:
Ca5(AsO4)3(OH)
Colour:
Light grayish white
Lustre:
Sub-Vitreous, Resinous, Waxy, Greasy
Hardness:
4½
Specific Gravity:
3.68
Crystal System:
Hexagonal
Member of:
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.
Type Locality:
Dimorph of:
Apatite Group. The arsenate analogue of Hydroxylapatite. The OH analogue of Svabite and Turneaureite.
Unique Identifiers
Mindat ID:
2105
Long-form identifier:
mindat:1:1:2105:6
Similar Names
| Johnbaumite-M | A discredited species name | Ca5(AsO4)3OH |
IMA Classification of Johnbaumite
Approved
IMA Formula:
Ca5(As5+O4)3OH
Approval year:
1980
First published:
1980
Classification of Johnbaumite
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
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
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
20 : Arsenates (also arsenates with phosphate, but without other anions)
2 : Arsenates of Be, Mg, Ca or Ba
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Jbm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Johnbaumite
Sub-Vitreous, Resinous, Waxy, Greasy
Transparency:
Transparent, Translucent
Colour:
Light grayish white
Streak:
White
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{1010}
{1010}
Fracture:
Irregular/Uneven
Density:
3.68 g/cm3 (Measured) 3.73 g/cm3 (Calculated)
Optical Data of Johnbaumite
Type:
Uniaxial (-)
RI values:
nω = 1.687 nε = 1.684
Birefringence:
0.003
Max. Birefringence:
δ = 0.003
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Optical Extinction:
Parallel
Pleochroism:
Non-pleochroic
Chemistry of Johnbaumite
Mindat Formula:
Ca5(AsO4)3(OH)
Element Weights:
Elements listed:
Crystallography of Johnbaumite
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Setting:
P63/m
Cell Parameters:
a = 9.7242(2) Å, c = 6.9657(9) Å
Ratio:
a:c = 1 : 0.716
Unit Cell V:
570.43 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020732 | Johnbaumite | Biagioni C, Pasero M (2013) The crystal structure of johnbaumite, Ca5(AsO4)3OH, the arsenate analogue of hydroxylapatite American Mineralogist 98 1580-1584 | 2013 | Harstigen mine, Varmland, Sweden | 0 | 293 | |
| 0004930 | Johnbaumite | Lee Y J, Stephens P W, Tang Y, Li W, Phillips B L, Parise J B, Reeder R J (2009) Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution American Mineralogist 94 666-675 |  | 2009 | synthetic | 0 | 293 |
| 0004929 | Johnbaumite | Lee Y J, Stephens P W, Tang Y, Li W, Phillips B L, Parise J B, Reeder R J (2009) Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution American Mineralogist 94 666-675 | | 2009 | synthetic | 0 | 293 |
| 0004928 | Johnbaumite | Lee Y J, Stephens P W, Tang Y, Li W, Phillips B L, Parise J B, Reeder R J (2009) Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution American Mineralogist 94 666-675 | | 2009 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.98 Å | (50) |
| 3.47 Å | (50) |
| 2.90 Å | (100) |
| 2.82 Å | (70) |
| 2.80 Å | (70) |
| 2.68 Å | (50) |
| 2.03 Å | (40) |
| 1.879 Å | (40) |
Comments:
ICDD 33-265
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| High-? alteration and/or metamorphism | |
| 32 : Ba/Mn/Pb/Zn deposits, including metamorphic deposits | |
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] | |
| 47g : [Halogen-bearing surface weathering minerals] |
Geological Setting:
Skarn
Type Occurrence of Johnbaumite
General Appearance of Type Material:
Grayish white masses and grains to 8 mm.
Place of Conservation of Type Material:
Royal Ontario Museum, Toronto, Canada.
The Natural History Museum, London, England.
Harvard University, Cambridge, Massachusetts, USA (116461).
The National Museum of Natural History, Washington, D.C., USA (144444).
The Natural History Museum, London, England.
Harvard University, Cambridge, Massachusetts, USA (116461).
The National Museum of Natural History, Washington, D.C., USA (144444).
Geological Setting of Type Material:
Metamorphic zinc-bearing skarn.
Associated Minerals at Type Locality:
Synonyms of Johnbaumite
Other Language Names for Johnbaumite
Relationship of Johnbaumite to other Species
Member of:
Other Members of Apatite Group:
| Alforsite | Ba5(PO4)3Cl | Hex. 6/m : P63/m |
| 'Apatite' | Ca5(PO4)3A | |
| Chlorapatite | Ca5(PO4)3Cl | Hex. 6/m : P63/m |
| Fluoralforsite | Ba5(PO4)3F | Hex. 6/m : P6/m |
| Fluorapatite | Ca5(PO4)3F | Hex. 6/m : P63/m |
| Fluorpyromorphite | Pb5(PO4)3F | Hex. 6/m : P63/m |
| Hydroxylapatite | Ca5(PO4)3(OH) | Hex. 6/m : P63/m |
| Hydroxylpyromorphite | Pb5(PO4)3(OH) | Hex. 6/mmm(6/m2/m2/m) : P63/mcm |
| Mimetite | Pb5(AsO4)3Cl | Hex. 6/m : P63/m |
| 'Oxypyromorphite' | Pb10(PO4)6O | |
| Pieczkaite | Mn5(PO4)3Cl | Hex. 6/m : P63/m |
| Pliniusite | Ca5(VO4)3F | Hex. 6/m : P63/m |
| Pyromorphite | Pb5(PO4)3Cl | Hex. 6/m : P63/m |
| Stronadelphite | Sr5(PO4)3F | Hex. 6/m : P63/m |
| Svabite | Ca5(AsO4)3F | Hex. 6/mmm(6/m2/m2/m) : P63/mmc |
| Turneaureite | Ca5(AsO4)3Cl | Hex. 6/m : P63/m |
| 'Unnamed (OH-analogue of Mimetite)' | Pb5(AsO4)3(OH) | Hex. 6/m : P63/m |
| Vanadinite | Pb5(VO4)3Cl | Hex. 6/m : P63/m |
Common Associates
Associations Based on Photo Data:
| 20 photos of Johnbaumite associated with Calcite | CaCO3 |
| 10 photos of Johnbaumite associated with Svabite | Ca5(AsO4)3F |
| 8 photos of Johnbaumite associated with Roweite | Ca2Mn2+2B4O7(OH)6 |
| 6 photos of Johnbaumite associated with Franklinite | Zn2+Fe3+2O4 |
| 6 photos of Johnbaumite associated with Andradite | Ca3Fe3+2(SiO4)3 |
| 5 photos of Johnbaumite associated with Willemite | Zn2SiO4 |
| 4 photos of Johnbaumite associated with Tilasite | CaMg(AsO4)F |
| 4 photos of Johnbaumite associated with Turneaureite | Ca5(AsO4)3Cl |
| 4 photos of Johnbaumite associated with Diopside | CaMgSi2O6 |
| 4 photos of Johnbaumite associated with Hausmannite | Mn2+Mn3+2O4 |
Related Minerals - Strunz-mindat Grouping
| 8.BN. | Fluoralforsite | Ba5(PO4)3F |
| 8.BN. | Aradite | BaCa6[(SiO4)(VO4)](VO4)2F |
| 8.BN. | Magganasite | CuFe3+3O(AsO4)3 |
| 8.BN. | Fluorpyromorphite | Pb5(PO4)3F |
| 8.BN. | Fluorsigaiite | Ca2Sr3(PO4)3F |
| 8.BN.05 | Pieczkaite | Mn5(PO4)3Cl |
| 8.BN.05 | Fluorapatite | Ca5(PO4)3F |
| 8.BN.05 | Fluorcaphite | SrCaCa3(PO4)3F |
| 8.BN.05 | Vanadinite | Pb5(VO4)3Cl |
| 8.BN.05 | Hedyphane | Ca2Pb3(AsO4)3Cl |
| 8.BN.05 | Hydroxylhedyphane | Ca2Pb3(AsO4)3(OH) |
| 8.BN.05 | 'Mimetite-M' | Pb5(AsO4)3Cl |
| 8.BN.05 | Pliniusite | Ca5(VO4)3F |
| 8.BN.05 | 'Hydroxylapatite-M' | Ca5(PO4)3OH |
| 8.BN.05 | Hydroxylpyromorphite | Pb5(PO4)3(OH) |
| 8.BN.05 | Miyahisaite | (Sr,Ca)2Ba3(PO4)3F |
| 8.BN.05 | Carlgieseckeite-(Nd) | NaNdCa3(PO4)3F |
| 8.BN.05 | Belovite-(Ce) | NaCeSr3(PO4)3F |
| 8.BN.05 | Kuannersuite-(Ce) | NaCeBa3(PO4)3F0.5Cl0.5 |
| 8.BN.05 | Alforsite | Ba5(PO4)3Cl |
| 8.BN.05 | 'Unnamed (OH-analogue of Mimetite)' | Pb5(AsO4)3(OH) |
| 8.BN.05 | Stronadelphite | Sr5(PO4)3F |
| 8.BN.05 | Parafiniukite | Ca2Mn3(PO4)3Cl |
| 8.BN.05 | Mimetite | Pb5(AsO4)3Cl |
| 8.BN.05 va | 'Germanate-pyromorphite' | Pb5(PO4)2GeO4 |
| 8.BN.05 | Belovite-(La) | NaLaSr3(PO4)3F |
| 8.BN.05 | Fluorphosphohedyphane | Ca2Pb3(PO4)3F |
| 8.BN.05 | Fluorstrophite | SrCaSr3(PO4)3F |
| 8.BN.05 | Hydroxylapatite | Ca5(PO4)3(OH) |
| 8.BN.05 | 'Johnbaumite-M' | Ca5(AsO4)3OH |
| 8.BN.05 | Phosphohedyphane | Ca2Pb3(PO4)3Cl |
| 8.BN.05 | Turneaureite | Ca5(AsO4)3Cl |
| 8.BN.05 | Morelandite | Ca2Ba3(AsO4)3Cl |
| 8.BN.05 | 'Oxypyromorphite' | Pb10(PO4)6O |
| 8.BN.05 | Deloneite | (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 |
| 8.BN.05 | Chlorapatite | Ca5(PO4)3Cl |
| 8.BN.05 | Pyromorphite | Pb5(PO4)3Cl |
| 8.BN.05 | Vanackerite | Pb4Cd(AsO4)3Cl |
| 8.BN.05 | Svabite | Ca5(AsO4)3F |
| 8.BN.10 | Arctite | Na2Ca4(PO4)3F |
| 8.BN.10 | Krügerite | BaCa6(SiO4)2[(P0.5S0.5)O4]2F |
| 8.BN.15 | Goryainovite | Ca2(PO4)Cl |
Fluorescence of Johnbaumite
Pinkish orange in SW only
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Johnbaumite
mindat.org URL:
https://www.mindat.org/min-2105.html
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Please feel free to link to this page.
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References for Johnbaumite
Reference List:
Dunn, Pete J., Peacor, Donald R., Newberry, Nancy (1980) Johnbaumite, a new member of the apatite group from Franklin, New Jersey. American Mineralogist, 65 (11-12) 1143-1145
Kusachi, Isao, Henmi, Chiyoko, Kobayashi, Shoichi (1996) Johnbaumite from Fuka, Okayama Prefecture, Japan. Mineralogical Journal, 18 (2) 60-66 doi:10.2465/minerj.18.60
Lee, Y. J., Stephens, P. W., Tang, Y., Li, W., Phillips, B. L., Parise, J. B., Reeder, R. J. (2009) Arsenate substitution in hydroxylapatite: Structural characterization of the Ca5(PxAs1-xO4)3OH solid solution. American Mineralogist, 94 (5) 666-675 doi:10.2138/am.2009.3120
Henderson, C. M. B., Bell, A. M. T., Charnock, J. M., Knight, K. S., Wendlandt, R. F., Plant, D. A., Harrison, W. J. (2009) Synchrotron X-ray absorption spectroscopy and X-ray powder diffraction studies of the structure of johnbaumite [Ca10(AsO4)6(OH,F)2] and synthetic Pb-, Sr- and Ba-arsenate apatites and some comments on the crystal chemistry of the apatite structure type in general. Mineralogical Magazine, 73 (3) 433-455 doi:10.1180/minmag.2009.073.3.433
Biagioni, C., Pasero, M. (2013) The crystal structure of johnbaumite, Ca5(AsO4)3OH, the arsenate analogue of hydroxylapatite. American Mineralogist, 98 (8) 1580-1584 doi:10.2138/am.2013.4443
Localities for Johnbaumite
Showing 16 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
China | |
| Desor (01/22) +1 other reference |
Germany | |
| Schimak et al. (02/2021) |
Italy | |
| Castellaro et al. (2021) |
Japan | |
| American Mineralogist (1999) +2 other references |
Romania | |
| Hirtopanu et al. (2015) +1 other reference |
Russia | |
| Malinko +3 other references |
Sweden | |
| Holtstam et al. (2001) |
| Eldjarn (2023) |
| Österberg (2003) +1 other reference |
| Holtstam et al. (1998) |
| Biagioni et al. (2013) |
| Nysten (2020) |
| Nysten et al. (2016) +1 other reference | |
USA (TL) | |
| Dunn et al. (1980) +1 other reference |
| Jenkins et al. (1994) +1 other reference |
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Franklin Mine, Franklin, Sussex County, New Jersey, USA