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Johnbaumite

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Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex Co., New Jersey, USA
© 2009, JGW

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Formula:
Ca
 
5
(AsO
 
4
)
 
3
OH
System:HexagonalColour:Light grayish white
Hardness:4½
Name:Named by Pete Dunn, Donald Peacor, and N. Newberry in 1980 in honor of Mr. John Leach Baum [1916 New York, New York - October 16, 2011 Hamburg, New Jersey], 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

IMA status:Approved 1980
Strunz 8th edition ID:7/B.39-80
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:41.8.3.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
Hey's CIM Ref.: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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Type Occurrence of Johnbaumite

Type Locality:Franklin Mine, Franklin, Franklin Mining District, Sussex Co., New Jersey, USA
General Appearance of Type Material:Grayish white masses
Year of Discovery:1980
Geological Setting of type material:Metamorphic zinc-bearing skarn
Associated Minerals at type locality:
ZinciteYeatmaniteRoméite GroupFrankliniteDiopside
CopperCalciteAndradite

Occurrences of Johnbaumite

Geological Setting:Skarn

Physical Properties of Johnbaumite

Lustre:Sub-Vitreous, Resinous, Waxy, Greasy
Diaphaneity (Transparency):Transparent, Translucent
Colour:Light grayish white
Streak:White
Hardness (Mohs):4½
Tenacity:Brittle
Cleavage:Distinct/Good
{10-10}
Fracture:Irregular/Uneven
Density (measured):3.68 g/cm3
Density (calculated):3.73 g/cm3

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:
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
Maximum Birefringence:δ = 0.003

Chart 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:
Ca
 
5
(AsO
 
4
)
 
3
OH
Essential elements:As, Ca, H, O
All elements listed in formula:As, Ca, H, O

Relationship of Johnbaumite to other Species

Common Associates:
CalciteBiotite
Related Minerals - Nickel-Strunz Grouping):

- +
8.BN.05Alforsite
Ba
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Belovite-(Ce)
NaCeSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Carbonate-rich Fluorapatite
Ca
 
5
(PO
 
4
,CO
 
3
)
 
3
(F,O)
8.BN.05Carbonate-rich Hydroxylapatite
Ca
 
5
(PO
 
4
,CO
 
3
)
 
3
(OH,O)
8.BN.05Chlorapatite
Ca
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Mimetite-M
Pb
 
5
(AsO
 
4
)
 
3
Cl
8.BN.05Johnbaumite-M
Ca
 
5
(AsO
 
4
)
 
3
OH
8.BN.05Fluorapatite
Ca
 
5
(PO
 
4
)
 
3
F
8.BN.05Hedyphane
Pb
 
3
Ca
 
2
(AsO
 
4
)
 
3
Cl
8.BN.05Hydroxylapatite
Ca
 
5
(PO
 
4
)
 
3
(OH)
8.BN.05Mimetite
Pb
 
5
(AsO
 
4
)
 
3
Cl
8.BN.05Morelandite
Ca
 
2
Ba
 
3
(AsO
 
4
)
 
3
Cl
8.BN.05Pyromorphite
Pb
 
5
(PO
 
4
)
 
3
Cl
8.BN.05Fluorstrophite
SrCaSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Svabite
Ca
 
5
(AsO
 
4
)
 
3
F
8.BN.05Turneaureite
Ca
 
5
(AsO
 
4
)
 
3
Cl
8.BN.05Vanadinite
Pb
 
5
(VO
 
4
)
 
3
Cl
8.BN.05Belovite-(La)
NaLaSr
 
3
(PO
 
4
)
 
3
F
8.BN.05Deloneite
(Na
 
0.5
REE
 
0.25
Ca
 
0
 · 25)(Ca
 
0.75
REE
 
0.25
)Sr
 
1.5
(CaNa
 
0.25
REE
 
0.25
)(PO
 
4
)
 
3
F
 
0.5
(OH)
 
0.5
8.BN.05Fluorcaphite
SrCaCa
 
3
(PO
 
4
)
 
3
F
8.BN.05Kuannersuite-(Ce)
NaCeBa
 
3
(PO
 
4
)
 
3
F
 
0.5
Cl
 
0.5
8.BN.05Hydroxylapatite-M
Ca
 
5
(PO
 
4
)
 
3
OH
8.BN.05Phosphohedyphane
Ca
 
2
Pb
 
3
(PO
 
4
)
 
3
Cl
8.BN.05Stronadelphite
Sr
 
5
(PO
 
4
)
 
3
F
8.BN.05Fluorphosphohedyphane
Ca
 
2
Pb
 
3
(PO
 
4
)
 
3
F
8.BN.10Arctite
Na
 
2
Ca
 
4
(PO
 
4
)
 
3
F
Related Minerals - Hey's Index Grouping:

- +
20.2.1Bearsite
Be
 
2
(AsO
 
4
)(OH) · 4H
 
2
O
20.2.2Brassite
Mg(HAsO
 
4
) · 4H
 
2
O
20.2.3Rösslerite
Mg(HAsO
 
4
) · 7H
 
2
O
20.2.4Hörnesite
Mg
 
3
(AsO
 
4
)
 
2
 · 8H
 
2
O
20.2.5Weilite
Ca(HAsO
 
4
)
20.2.7Haidingerite
CaHAsO
 
4
 · H
 
2
O
20.2.8Pharmacolite
Ca(HAsO
 
4
) · 2H
 
2
O
20.2.9Sainfeldite
CaCa
 
2
Ca
 
2
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.10Vladimirite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 5H
 
2
O
20.2.11Guérinite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.12Ferrarisite
Ca
 
5
(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 9H
 
2
O
20.2.13Rauenthalite
Ca
 
3
(AsO
 
4
)
 
2
 · 10H
 
2
O
20.2.14Phaunouxite
Ca
 
3
(AsO
 
4
)
 
2
 · 11H
 
2
O
20.2.15Mcnearite
NaCa
 
5
(AsO
 
4
)(HAsO
 
4
)
 
4
 · 4H
 
2
O
20.2.16Bergslagite
CaBeAsO
 
4
(OH)
20.2.17Adelite
CaMg(AsO
 
4
)(OH)
20.2.18Talmessite
Ca
 
2
Mg(AsO
 
4
)
 
2
 · 2H
 
2
O
20.2.19Irhtemite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 4H
 
2
O
20.2.20Camgasite
CaMg(AsO
 
4
)(OH) · 5H
 
2
O
20.2.21Picropharmacolite
Ca
 
4
Mg(AsO
 
4
)
 
2
(HAsO
 
4
)
 
2
 · 11H
 
2
O
20.2.22Bariopharmacosiderite
Ba
 
0.5
Fe
3+
4
(AsO
 
4
)
 
3
(OH)
 
4
 · 5H
 
2
O

Other Names for Johnbaumite

Synonyms:
IMA1980-B
Other Languages:
German:Johnbaumit
Spanish:Johnbaumita

Other Information

Fluorescence in UV light:Pinkish orange in SW only
Health Warning: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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Johnbaumite details from Handbook of Mineralogy (PDF)
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    • Localities for Johnbaumite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? 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
            • Bitchu-cho (Bicchu-cho)
    		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 (Buryatia) Republic
          • 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
    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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