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Paulkerrite

A valid IMA mineral species
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06778050017271925821328.jpg
Paulkerrite, etc.

7U7 Ranch, Bagdad Mine area, Hillside, Eureka Mining District, Yavapai County, Arizona, USA
06850140017271925748840.jpg
Paulkerrite

Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
01474930017272044647299.jpg
Paulkerrite

Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
00908490017271925723740.jpg
Paulkerrite, etc.

7U7 Ranch, Bagdad Mine area, Hillside, Eureka Mining District, Yavapai County, Arizona, USA
06850140017271925748840.jpg
Paulkerrite

Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
01474930017272044647299.jpg
Paulkerrite

Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
06778050017271925821328.jpg
Paulkerrite, etc.

7U7 Ranch, Bagdad Mine area, Hillside, Eureka Mining District, Yavapai County, Arizona, USA
06850140017271925748840.jpg
Paulkerrite

Sítio do Castelo Mine, Folgosinho, Gouveia, Guarda, Portugal
Hide all sections | Show all sections

About PaulkerriteHide

06405880017271925858760.jpg
Paul Francis Kerr
Formula:
K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
Colour:
Colorless to very light yellow-brown
Lustre:
Vitreous, Sub-Vitreous
Hardness:
3
Specific Gravity:
2.36
Crystal System:
Monoclinic
Name:
Named by Donald Peacor, Pete Dunn, and William Simmons in honor of Paul Francis Kerr [January 12, 1897 Helmet, California, USA - February 27, 1981 Chicago, Illinois, USA], professor of mineralogy, Columbia University, New York, New York, USA.
Compare Mantienneite, also Benyacarite.




Unique IdentifiersHide

Mindat ID:
3134
Long-form identifier:
mindat:1:1:3134:5

IMA Classification of PaulkerriteHide

Classification of PaulkerriteHide

Strunz-mindat (2025):
8.DH.35

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.:
42.11.21.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
Hey's CIM Ref.:
19.8.24

19 : Phosphates
8 : Phosphates of Al and other metals

Mineral SymbolsHide

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

SymbolSourceReference
PkeIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of PaulkerriteHide

Lustre:
Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless to very light yellow-brown
Streak:
White
Hardness:
3 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100} perfect
Fracture:
Sub-Conchoidal
Density:
2.36 g/cm3 (Measured)    2.36 g/cm3 (Calculated)

Optical Data of PaulkerriteHide

Type:
Biaxial (-)
RI values:
nα = 1.591 - 1.598 nβ = 1.615 - 1.624 nγ = 1.639 - 1.643
2V:
Measured: 80° , Calculated: 78° to 88°
Birefringence:
0.045
Max. Birefringence:
δ = 0.048
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.

Surface Relief:
Moderate
Dispersion:
r > v strong
Optical Extinction:
Parallel, XYZ = cba
Pleochroism:
Non-pleochroic

Chemistry of PaulkerriteHide

Mindat Formula:
K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
Element Weights:
Element% weight
O57.358 %
P13.064 %
Fe11.777 %
Mg5.126 %
Ti5.047 %
K4.123 %
H3.507 %

Calculated from ideal end-member formula.
Elements listed:
Al, Fe, H, K, Mg, Mn, O, P, Ti - search for minerals with similar chemistry

Crystallography of PaulkerriteHide

Crystal System:
Monoclinic
Class (H-M):
m - Domatic
Cell Parameters:
a = 10.569(2) Å, b = 20.590(4) Å, c = 12.413(2) Å
β = 90.33(3)°
Ratio:
a:b:c = 0.513 : 1 : 0.603
Unit Cell V:
2,701.22 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Nearly colorless equant to nearly equant flattened crystals with simple forms: {010}, {100}, and {111}.
Comment:
p21/c

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
10.3 Å(90)
7.46 Å(80)
6.20 Å(100)
3.75 Å(40)
3.13 Å(70)
2.872 Å(40)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
Stage 4b: Highly evolved igneous rocks>3.0
34 : Complex granite pegmatites
Stage 7: Great Oxidation Event<2.4
47a : [Near-surface hydration of prior minerals]
47c : [Carbonates, phosphates, borates, nitrates]
47e : [Vanadates, chromates, manganates]
Geological Setting:
Granite pegmatite

Type Occurrence of PaulkerriteHide

Type Locality:
ⓘ 7U7 Ranch (7-U-7 Ranch), Bagdad Mine area, Hillside, Eureka Mining District, Yavapai County, Arizona, USA
General Appearance of Type Material:
Flattened to equant transparent nearly colorless to very light yellowish brown 0.2 mm crystals.
Place of Conservation of Type Material:
National Museum of Natural History (Smithsonian), Washington, D.C., USA, R7778, 120405, 163777.
Geological Setting of Type Material:
Secondary phosphate mineralization in a granite pegmatite.
Associated Minerals at Type Locality:
BermaniteLeucophosphitePhosphosideriteStrengiteTriplite
Reference:
Dunn, Pete J., Simmons, William B., Peacor, Donald R. (1984) Paulkerrite, a new titanium phosphate from Arizona. The Mineralogical Record, 15 (5) 303-306

Synonyms of PaulkerriteHide

Other Language Names for PaulkerriteHide

Relationship of Paulkerrite to other SpeciesHide

Member of:
Paulkerrite Group
Other Members of Paulkerrite Group:
Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Fluor-rewitzerite [(H2O)K]Mn2(Al2Ti)(PO4)4(OF)(H2O)10 · 4H2OMon. 2/m : P21/b
Fluormacraeite [(H2O)K]Mn2(Fe2Ti)(PO4)4(OF)(H2O)10 · 4H2OMon. 2/m : P21/b
HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Hydroxylbenyacarite(H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. mmm (2/m 2/m 2/m) : Pbca
MacraeiteK(H2O)Mn2(Fe2Ti)(PO4)4[O(OH)](H2O)10 · 4H2OMon. 2/m : P21/b
MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Pleysteinite[(H2O)0.5K0.5]2Mn2Al3(PO4)4F2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
Rewitzerite[K(H2O)]Mn2Al3(PO4)4(OH)2 · 14H2OMon. 2/m : P21/b
Sperlingite (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2OMon. 2/m : P21/b

Common AssociatesHide

Associated Minerals Based on Photo Data:
6 photos of Paulkerrite associated with PhosphosideriteFePO4 · 2H2O
2 photos of Paulkerrite associated with Rockbridgeite(Fe2+0.5Fe3+0.5)2Fe3+3(PO4)3(OH)5
2 photos of Paulkerrite associated with LeucophosphiteKFe3+2(PO4)2(OH) · 2H2O
2 photos of Paulkerrite associated with Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2O
2 photos of Paulkerrite associated with Nsutite(Mn4+,Mn2+)(O,OH)2
2 photos of Paulkerrite associated with StrengiteFePO4 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

8.DH.Thebaite-(NH4)(NH4)3Al(C2O4)(PO3OH)2(H2O)Mon. 2/m : P21/b
8.DH.Whiteite-(MnMnMn)Mn2+Mn2+Mn2+2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.FerroberauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
8.DH.RegeriteKFe6(PO4)4(OH)7(H2O)6 · 4H2OMon. 2/m : P21/b
8.DH.Ammoniotinsleyite(NH4)Al2(PO4)2(OH) · 2H2OMon. 2/m : P21/m
8.DH.Dendoraite-(NH4)(NH4)2NaAl(C2O4)(PO3OH)2(H2O)2Mon. 2/m
8.DH.Rowleyite[Na(NH4,K)9Cl4][V5+,4+2(P,As)O8]6 · n[H2O,Na,NH4,K,Cl]Iso.
8.DH.HochleitneriteMn2Ti3(PO4)4O2(H2O)2 · 14H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.Whiteite-(CaMnFe)CaMnFe2Al2(PO4)4(OH)2 · 8H2OMon. 2/m
8.DH.05MinyuliteKAl2(PO4)2F · 4H2OOrth. mm2 : Pba2
8.DH.10LeucophosphiteKFe3+2(PO4)2(OH) · 2H2OMon. 2/m : P21/b
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2OMon. 2/m
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaMnMn){Na}{Mn2+}{(Mn2+,Fe3+)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.15Whiteite-(MnMnMg)MnMnMg2Al2(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaMnZn){Ca}{Mn2+}{Zn2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnMg){Mn2+}{Mn2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(MnMnFe){Mn2+}{Mn2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe2+2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon.
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,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.15Jahnsite-(NaMnMg){(Na,Ca)}{(Mn2+,Fe3+)}{(Mg,Fe3+)2}{Fe3+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.15Jahnsite-(MnMnZn){Mn2+}{Mn2+}{Zn2}{Fe3+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.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-(CaFeMg){Ca}{Fe2+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Whiteite-(CaMnMn){Ca}{Mn2+}{Mn2}{Al2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.15Jahnsite-(NaFeMg){Na}{Fe3+}{Mg2}{Fe3+2}(PO4)4(OH)2 · 8H2OMon. 2/m : P2/b
8.DH.20SegeleriteCa2 Mg2 Fe3+2(PO4)4(OH)2 · 8H2OOrth. mmm (2/m 2/m 2/m) : Pcca
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.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.20OveriteCaMgAl(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.25ZodaciteCa4Mn2+Fe3+4(PO4)6(OH)4 · 12H2OMon.
8.DH.25FanfaniiteCa4MnAl4(PO4)6(OH)4 · 12H2OMon. 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.30PararobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. 2/m : P21/b
8.DH.30RobertsiteCa2Mn3+3(PO4)3O2 · 3H2OMon. m : Bb
8.DH.30ArseniosideriteCa2Fe3+3(AsO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30Sailaufite(Ca,Na,◻)2Mn3+3(AsO4)2(CO3)O2 · 3H2OMon. m : Bm
8.DH.30MitridatiteCa2Fe3+3(PO4)3O2 · 3H2OMon. 2/m : B2/b
8.DH.30KolfaniteCa2Fe3+3O2(AsO4)3 · 2H2OMon.
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Sperlingite (H2O)K(Mn2+Fe3+)(Al2Ti)(PO4)4[O(OH)] [(H2O)9(OH)] · 4H2OMon. 2/m : P21/b
8.DH.35Hydroxylbenyacarite(H2O)2Mn2(Ti2Fe)(PO4)4[O(OH)](H2O)10 · 4H2O Orth. 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.35Benyacarite(H2O)2Mn2Ti2Fe3+(PO4)4(OF)(H2O)10 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
8.DH.35Fluormacraeite [(H2O)K]Mn2(Fe2Ti)(PO4)4(OF)(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

RadioactivityHide

Radioactivity:
Element % Content Activity (Bq/kg) Radiation Type
Uranium (U) 0.0000% 0 α, β, γ
Thorium (Th) 0.0000% 0 α, β, γ
Potassium (K) 4.1225% 1,278 β, γ

For comparison:

  • Banana: ~15 Bq per fruit
  • Granite: 1,000–3,000 Bq/kg
  • EU exemption limit: 10,000 Bq/kg

Note: Risk is shown relative to daily recommended maximum exposure to non-background radiation of 1000 µSv/year. Note that natural background radiation averages around 2400 µSv/year so in reality these risks are probably extremely overstated! With infrequent handling and safe storage natural radioactive minerals do not usually pose much risk.

Interactive Simulator:

Note: The mass selector refers to the mass of radioactive mineral present, not the full specimen, also be aware that the matrix may also be radioactive, possibly more radioactive than this mineral!

Activity: –

DistanceDose rateRisk
1 cm
10 cm
1 m

The external dose rate (D) from a radioactive mineral is estimated by summing the gamma radiation contributions from its Uranium, Thorium, and Potassium content, disregarding daughter-product which may have a significant effect in some cases (eg 'pitchblende'). This involves multiplying the activity (A, in Bq) of each element by its specific gamma ray constant (Γ), which accounts for its unique gamma emissions. The total unshielded dose at 1 cm is then scaled by the square of the distance (r, in cm) and multiplied by a shielding factor (μshield). This calculation provides a 'worst-case' or 'maximum risk' estimate because it assumes the sample is a point source and entirely neglects any self-shielding where radiation is absorbed within the mineral itself, meaning actual doses will typically be lower. The resulting dose rate (D) is expressed in microsieverts per hour (μSv/h).

D = ((AU × ΓU) + (ATh × ΓTh) + (AK × ΓK)) / r2 × μshield

Fluorescence of PaulkerriteHide

In UV light:
Not fluorescent

Other InformationHide

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 PaulkerriteHide

References for PaulkerriteHide

Localities for PaulkerriteHide

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.
Czech Republic
 
  • Vysočina Region
    • Žďár nad Sázavou District
      • Bory
Staněk (1991) +4 other references
Staněk (1997)
Germany
 
  • Bavaria
    • Upper Palatinate
      • Neustadt an der Waldnaab District
        • Waidhaus
Dill et al. (2011)
      • Tirschenreuth District
        • Plößberg
DILL et al. (2009)
DILL et al. (2009)
Morocco
 
  • Marrakesh-Safi Region
    • Rehamna Province
      • Sidi Bou Othmane Cercle
        • Jebilet Mtn (Djebilet Mtn)
          • Sidi Bou Othmane
Favreau (2012)
Portugal
 
  • Guarda
    • Gouveia
      • Folgosinho
Schnorrer et al. (2005)
Lapis 15 (7/8)
    • Sabugal
      • Bendada
Schnorrer-Köhler et al. (1991)
USA (TL)
 
  • Arizona
    • Yavapai County
      • Eureka Mining District
        • Hillside
          • Bagdad Mine area
Dunn et al. (1984) +1 other reference
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