Johnbaumite-M
A discredited species name
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About Johnbaumite-M
Formula:
Ca5(AsO4)3OH
Colour:
White to light pink
Lustre:
Greasy
Hardness:
5
Specific Gravity:
3.518
Crystal System:
Monoclinic
First Recorded Locality:
Dimorph of:
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.
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.
Unique Identifiers
Mindat ID:
1482
Long-form identifier:
mindat:1:1:1482:9
Similar Names
| Johnbaumite | A valid IMA mineral species | Ca5(AsO4)3(OH) |
IMA Classification of Johnbaumite-M
Discredited
Classification of Johnbaumite-M
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
41.8.3.4
41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq
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
22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride
Physical Properties of Johnbaumite-M
Greasy
Transparency:
Translucent
Colour:
White to light pink
Streak:
White
Hardness:
5 on Mohs scale
Fracture:
Irregular/Uneven
Density:
3.518 g/cm3 (Measured) 3.41 g/cm3 (Calculated)
Optical Data of Johnbaumite-M
Type:
Uniaxial (-)
RI values:
nω = 1.66 nε = 1.655
Max. Birefringence:
δ = 0.005
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.
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.
Surface Relief:
Moderate
Chemistry of Johnbaumite-M
Mindat Formula:
Ca5(AsO4)3OH
Element Weights:
Elements listed:
Crystallography of Johnbaumite-M
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Cell Parameters:
a = 9.55 Å, c = 6.98 Å
Ratio:
a:c = 1 : 0.731
Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Crystals crudely prismatic; massive, granular.
Comment:
Pseudohexagonal
First Recorded Occurrence of Johnbaumite-M
Place of Conservation of First Recorded Material:
Smithsonian 94809
Geological Setting of First Recorded Material:
Manganese deposit
Synonyms of Johnbaumite-M
Other Language Names for Johnbaumite-M
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 | Johnbaumite | Ca5(AsO4)3(OH) |
| 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 | 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-M
Fluoresces bright orange to yellow orange in SWUV
Other Information
Notes:
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.
Internet Links for Johnbaumite-M
mindat.org URL:
https://www.mindat.org/min-1482.html
Please feel free to link to this page.
Please feel free to link to this page.
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References for Johnbaumite-M
Reference List:
Herbert Smith, G. F., Prior, G. T. (1911) On Fermorite, a new arsenate and Phosphate of lime and strontia, and Tilasite, from the manganese-ore deposits of India. Mineralogical Magazine and Journal of the Mineralogical Society, 16 (74) 84-96 doi:10.1180/minmag.1911.016.74.02
Localities for Johnbaumite-M
Showing 1 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.
India (FRL) | |
| Mineralogical Magazine (1911) |
Sitapur village, Chhindwara District, Jabalpur Division, Madhya Pradesh, India