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Johnbaumite-M

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Formula:
Ca5(AsO4)3OH
System:
Monoclinic
Colour:
White to light pink
Hardness:
5
Apatite Supergroup.
The arsenate analogue and monoclinic polymorph of hydroxylapatite.

Previously called 'fermorite', this mineral was reclassified as the monoclinic polymorph of Johnbaumite by Pasero et al. (2010), and is no longer regarded as a distinct mineral species.


Note: The orginal chemical analysis (from 1911) gave (PO4)1.60(AsO4)1.24, making fermorite a phosphate. A modern microprobe analysis of the type material, however, gave (PO4)1.45(AsO4)1.48 - thus this mineral is now defined as an arsenate.

Classification of Johnbaumite-M

Discredited 2010
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
41.8.3.4

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
22.1.30

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
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First Recorded Occurrence of Johnbaumite-M

Place of Conservation of First Recorded Material:
Smithsonian 94809
Year of Discovery:
1910
Geological Setting of First Recorded Material:
Manganese deposit

Physical Properties of Johnbaumite-M

Greasy
Diaphaneity (Transparency):
Translucent
Colour:
White to light pink
Streak:
White
Hardness (Mohs):
5
Fracture:
Irregular/Uneven
Density:
3.518 g/cm3 (Measured)    3.41 g/cm3 (Calculated)

Crystallography of Johnbaumite-M

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.55Å, c = 6.98Å
Ratio:
a:c = 1 : 0.731
Unit Cell Volume:
V 0.00 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals crudely prismatic; massive, granular.
Comment:
Pseudohexagonal

Optical Data of Johnbaumite-M

Type:
Uniaxial (-)
RI values:
nω = 1.660 nε = 1.655
Max Birefringence:
δ = 0.005
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Johnbaumite-M

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

Relationship of Johnbaumite-M 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)
JohnbaumiteCa5(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
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.05FluorapatiteCa2Ca3(PO4)3F
8.BN.05HedyphanePb3Ca2(AsO4)3Cl
8.BN.05HydroxylapatiteCa5(PO4)3(OH)
8.BN.05JohnbaumiteCa5(AsO4)3OH
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
22.1.1AmblygoniteLiAl(PO4)F
22.1.2LacroixiteNaAl(PO4)F
22.1.3NatrophosphateNa7(PO4)2F · 19H2O
22.1.5NacaphiteNa2Ca(PO4)F
22.1.6ArctiteNa2Ca4(PO4)3F
22.1.7NefedoviteNa5Ca4(PO4)4F
22.1.9FluorapatiteCa2Ca3(PO4)3F
22.1.10HerderiteCaBePO4(F,OH)
22.1.11IsokiteCaMg(PO4)F
22.1.12PanasqueiraiteCaMg(PO4)(OH,F)
22.1.13BabefphiteBaBePO4(F,OH)
22.1.14FluelliteAl2(PO4)F2(OH) · 7H2O
22.1.15MinyuliteKAl2(PO4)2(OH,F) · 4H2O
22.1.16MoriniteNaCa2Al2(PO4)2(OH)F4 · 2H2O
22.1.17BøggilditeNa2Sr2Al2PO4F9
22.1.18FluorstrophiteSrCaSr3(PO4)3F
22.1.19ViitaniemiiteNa(Ca,Mn2+)Al(PO4)(F,OH)3
22.1.20VäyryneniteMn2+Be(PO4)(OH,F)
22.1.21MaxwelliteNaFe3+(AsO4)F
22.1.22Wagnerite(Mg,Fe2+)2(PO4)F
22.1.23Triplite(Mn2+,Fe2+)2(PO4)(F,OH)
22.1.24Magniotriplite(Mg,Fe2+,Mn2+)2PO4F
22.1.25Zwieselite(Fe2+,Mn2+)2(PO4)F
22.1.26McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2O
22.1.27RichelliteCaFe23+(PO4)2(OH,F)2
22.1.28SvabiteCa5(AsO4)3F
22.1.29TilasiteCaMg(AsO4)F
22.1.31DurangiteNaAl(AsO4)F

Other Names for Johnbaumite-M

Name in Other Languages:
Simplified Chinese:锶磷灰石
Spanish:Fermorita
Traditional Chinese:鍶磷灰石

Other Information

Fluoresces bright orange to yellow orange in SWUV
Other Information:
Soluble in acids.
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-M

Reference List:
Smith and Prior (1911) Mineralogical Magazine: 16: 84.

McConnell (1938) American Mineralogist: 23: 1.

Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II. John Wiley and Sons, Inc., New York, 7th edition, revised and enlarged, 1124 pp.: 904.

Neues Jahrbuch für Mineralogie, Monatshefte (1991): 327.

Anthony, J.W., Bideaux, R.A., Bladh, K.W., and Nichols, M.C. (2000) Handbook of Mineralogy, Volume IV. Arsenates, Phosphates, Vanadates. Mineral Data Publishing, Tucson, AZ, 680pp.: 171.

Pasero, M., Kampf, A. R., Ferraris, C., Pekov, I. V., Rakovan, J. and White, T. J. (2010): Nomenclature of the apatite supergroup minerals. European Journal of Mineralogy 22, 163-179.

Internet Links for Johnbaumite-M

Localities for Johnbaumite-M

(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.
India
 
  • Madhya Pradesh
    • Jabalpur Division
      • Chhindwara District (Chindawara District; Chindwara District)
Min.Mag.(1911) 16, 84-96
Mineral and/or Locality  
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