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Jahnsite-(NaMnMg)

A valid IMA mineral species
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02110500015421173172290.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
05727100015421200442910.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
06114710017075976573445.jpg
Jahnsite-(NaMnMg)

White Rock No. 2 pegmatite, White Rock Feldspar Mine, Old Boolcoomata Station, Bimbowrie Conservation Park, Olary Province, South Australia, Australia
00582620015421173003987.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
07310140015421175439526.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
09771240017057640464478.jpg
Jahnsite-(NaMnMg)

White Rock No. 2 pegmatite, White Rock Feldspar Mine, Old Boolcoomata Station, Bimbowrie Conservation Park, Olary Province, South Australia, Australia
02110500015421173172290.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
05727100015421200442910.jpg
Jahnsite-(NaMnMg)

Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
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About Jahnsite-(NaMnMg)Hide

09464680015089749626401.jpg
Richard H. Jahns
Formula:
{(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O
Colour:
Light orange to orange-yellow
Lustre:
Vitreous
Hardness:
4
Specific Gravity:
2.68
Crystal System:
Monoclinic
Name:
The root name is in honor of Richard Henry Jahns (March 10, 1915 Los Angeles, California, USA - December 31, 1983 Palo Alto, California, USA), mineralogist and pegmatite expert, Stanford University, Palo Alto, California, USA. The suffix indicates metal site occupancies.
Jahnsite Subgroup.




Unique IdentifiersHide

Mindat ID:
35967
Long-form identifier:
mindat:1:1:35967:4
GUID
(UUID V4):
7e817e3f-e9ff-45be-806f-60cb810c675f

IMA Classification of Jahnsite-(NaMnMg)Hide

IMA status:
Approved
IMA Formula:
(Na,Ca)(Mn2+,Fe3+)(Mg,Fe3+)2Fe3+2(PO4)4(OH)2(H2O)8
Approval year:
2018
First published:
2018
Approval history:
Pre-2018: Unnamed, but probably valid.
2018: Approved by IMA as a new species (IMA 2018-017).
Type description reference:
Kampf, A.R., Elliott, P., Nash, B.P., Chiappino, L., Varvello, S. (2018) Jahnsite-(NaMnMg), a new jahnsite-group mineral from the Sapucaia mine, Brazil and the White Rock No. 2 quarry, Australia. The Canadian Mineralogist: 56(6): 871-882.

Classification of Jahnsite-(NaMnMg)Hide

Strunz-mindat (2024):
8.DH.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
H : With large and medium-sized cations, (OH, etc.):RO4 < 1:1
Dana 8th ed.:
42.11.2.8

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

SymbolSourceReference
Jah-NaMnMgIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
JhnThe Canadian Mineralogist (2019)The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Physical Properties of Jahnsite-(NaMnMg)Hide

Lustre:
Vitreous
Transparency:
Transparent
Colour:
Light orange to orange-yellow
Streak:
Very pale yellow
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{001}
Fracture:
Irregular/Uneven, Splintery
Density:
2.68(1) g/cm3 (Measured)    2.684 g/cm3 (Calculated)

Optical Data of Jahnsite-(NaMnMg)Hide

Type:
Biaxial (-)
RI values:
nα = 1.642(1) nβ = 1.675(1) nγ = 1.677(1)
2V:
Measured: 27° (2), Calculated: 27.2°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
Very strong; r< v
Pleochroism:
Visible
Comments:
X = colorless, Y and Z = orange-yellow
Comments:
Y ≈ Z = X
Optical orientation: Z = b; XΛc = 51° in obtuse b

Chemistry of Jahnsite-(NaMnMg)Hide

Mindat Formula:
{(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O
Elements listed:
Ca, Fe, H, Mg, Mn, Na, O, P - search for minerals with similar chemistry

Crystallography of Jahnsite-(NaMnMg)Hide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 15.104(1) Å, b = 7.1629(2) Å, c = 9.8949(7) Å
β = 110.640(7)°
Ratio:
a:b:c = 2.109 : 1 : 1.381
Unit Cell V:
1,001.80 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Elongate on [100], exhibiting the forms {100}, {001}, and {011}.
Twinning:
Ubiquitously twinned by reflection on {001}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.29 Å(100)
5.02 Å(27)
4.91 Å(30)
3.546 Å(32)
2.975 Å(26)
2.834 Å(91)
2.601 Å(33)
1.944 Å(33)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites

Type Occurrence of Jahnsite-(NaMnMg)Hide

Co-Type Localities:
ⓘ White Rock No. 2 pegmatite, White Rock Feldspar Mine, Old Boolcoomata Station, Bimbowrie Conservation Park, Olary Province, South Australia, Australia
ⓘ Sapucaia mine, Sapucaia do Norte, Galiléia, Minas Gerais, Brazil
General Appearance of Type Material:
Zoned yellow crystals with orange-red bands near their terminations. prisms, elongate on [100].
Place of Conservation of Type Material:
The holotype specimen from the Sapucaia mine is housed in the collections of the Mineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, California 90007, USA, catalogue number 66701. The cotype specimen from the White Rock No. 2 quarry is deposited in the collections of the South Australian Museum, North Terrace, Adelaide, South Australia, Australia, registration number G34298.
Geological Setting of Type Material:
Pegmatite
Associated Minerals at Type Locality:
UshkoviteRockbridgeiteMitridatiteLeucophosphiteHeterosite
DufréniteDufrénite
Reference:
Kampf, A.R., Elliott, P., Nash, B.P., Chiappino, L., Varvello, S. (2018) Jahnsite-(NaMnMg), a new jahnsite-group mineral from the Sapucaia mine, Brazil and the White Rock No. 2 quarry, Australia. The Canadian Mineralogist: 56(6): 871-882.
Download:
https://rruff.info/rruff_1.0/uploads/CM56_871.pdf

Synonyms of Jahnsite-(NaMnMg)Hide

Relationship of Jahnsite-(NaMnMg) to other SpeciesHide

Member of:
Jahnsite Subgroup > Jahnsite Group
Other Members of this group:
Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
Jahnsite-(CaFeMg)CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(CaMnZn)CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(MnMnFe)Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(MnMnMg)Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
Jahnsite-(MnMnZn)Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
Jahnsite-(NaMnMn)NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
3 photos of Jahnsite-(NaMnMg) associated with Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2O
3 photos of Jahnsite-(NaMnMg) associated with Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
2 photos of Jahnsite-(NaMnMg) associated with Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2O

Related Minerals - Strunz-mindat GroupingHide

8.DH.FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DH.Rowleyite[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl]Iso.
8.DH.Ammoniotinsleyite(NH4)Al2(PO4)2(OH) · 2H2OMon. 2/m : P21/m
8.DH.Thebaite-(NH4)(NH4)3Al(C2O4)(PO3OH)2(H2O)Mon. 2/m : P21/b
8.DH.Dendoraite-(NH4)(NH4)2NaAl(C2O4)(PO3OH)2(H2O)2Mon. 2/m
8.DH.Whiteite-(MnMnMn)Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.Whiteite-(CaMnFe)CaMnFe2Al2(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.RegeriteKFe6(PO4)4(OH)7(H2O)6 · 4H2OMon. 2/m : P21/b
8.DH.Hydroxylbenyacarite(H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. mmm (2/m 2/m 2/m) : Pbca
8.DH.05MinyuliteKAl2(PO4)2F · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon. 2/m
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15KeckiteCaMn2+(Fe3+Mn2+)Fe3+2(PO4)4(OH)3 · 7H2OMon. 2/m : P2/b
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P21/b
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2OOrth.
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnMg)Mn2+Mn2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaFeMg)CaFe2+Mg2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnFe)Mn2+Mn2+Fe2+2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMgMg)CaMg3Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnZn)Mn2+Mn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMn)NaMn2+(Mn2+Fe3+)Σ2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnZn)CaMn2+Zn2Fe3+2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.20Lun'okite(Mn,Ca)(Mg,Fe,Mn)Al(PO4)2OH · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.25CalcioferriteCa2Fe3+2(PO4)3(OH) · 7H2OMon. 2/m : B2/b
8.DH.25KingsmountiteCa3MnFeAl4(PO4)6(OH)4 · 12H2OTric. 1 : P1
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
8.DH.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.25FanfaniiteCa4MnAl4(PO4)6(OH)4 · 12H2OMon. 2/m : B2/b
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30Sailaufite(Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon. m : Bm
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OMon. m
8.DH.35Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35MacraeiteK(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2OMon. 2/m : P21/b
8.DH.40XanthoxeniteCa4Fe3+2(PO4)4(OH)2 · 3H2OTric. 1 : P1
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2OTet. 4/mmm (4/m 2/m 2/m) : I4/mmm
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2OMon. 2/m : P21/m
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
8.DH.60BouazzeriteBi6(Mg,Co)11Fe3+14(AsO4)18(OH)4O12 · 86H2OMon. 2/m
8.DH.65GalliskiiteCa4Al2(PO4)2F8 · 5H2OTric. 1 : P1
8.DH.70JoteiteCa2CuAl(AsO4)[AsO3(OH)]2(OH)2 · 5H2OTric. 1 : P1
8.DH.75KampeliteBa6Mg3Sc8(PO4)12(OH)6 · 7H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DH.80KapundaiteNaCaFe4(PO4)4(OH)3 · 5H2OTric. 1 : P1
8.DH.85VaniniiteCa2Mn2+3Mn3+2O2(AsO4)4 · 2H2OMon. 2/m : P21/b

Fluorescence of Jahnsite-(NaMnMg)Hide

Other InformationHide

Notes:
At room temperature, the mineral is slowly soluble in dilute HCl.
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 Jahnsite-(NaMnMg)Hide

References for Jahnsite-(NaMnMg)Hide

Localities for Jahnsite-(NaMnMg)Hide

This 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.

Locality ListHide

- 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). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Australia (TL)
 
  • South Australia
    • Olary Province
      • Bimbowrie Conservation Park
        • Old Boolcoomata Station
          • White Rock Feldspar Mine
Kampf et al. (2018) +1 other reference
Brazil (TL)
 
  • Minas Gerais
    • Galiléia
      • Sapucaia do Norte
Mineralogical Magazine: 82: 779-785. +2 other references
USA
 
  • South Dakota
    • Custer County
      • Custer Mining District
        • Fourmile
Kampf et al. (2008)
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