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Paulkerrite

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Paul Francis Kerr
Formula:
K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
System:
Orthorhombic
Colour:
Colorless to very light ...
Hardness:
3
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.

Classification of Paulkerrite

Approved 1984
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
42.11.21.1

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

19 : Phosphates
8 : Phosphates of Al and other metals
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Type Occurrence of Paulkerrite

General Appearance of Type Material:
Flattened to equant transparent nearly colorless to very light yellowish brown 0.2 mm crystals
Year of Discovery:
1984
Geological Setting of Type Material:
Secondary phosphate mineralization in a granite pegmatite

Occurrences of Paulkerrite

Geological Setting:
Granite pegmatite

Physical Properties of Paulkerrite

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

Crystallography of Paulkerrite

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Space Group Setting:
Pbca
Cell Parameters:
a = 10.497Å, b = 20.751Å, c = 12.442Å
Ratio:
a:b:c = 0.506 : 1 : 0.6
Unit Cell Volume:
V 2,710.16 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Nearly colorless equant to nearly equant flattened crystals with simple forms: {010}, {100}, and {111}.
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.3 (90)
7.46 (80)
6.20 (100)
3.75 (40)
3.13 (70)
2.872 (40)

Optical Data of Paulkerrite

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
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v strong
Optical Extinction:
Parallel, XYZ = cba
Pleochroism:
Non-pleochroic

Chemical Properties of Paulkerrite

Formula:
K(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2O
Essential elements:
All elements listed in formula:

Relationship of Paulkerrite to other Species

8.DH.05MinyuliteKAl2(PO4)2(OH,F) · 4H2O
8.DH.10LeucophosphiteKFe23+(PO4)2(OH) · 2H2O
8.DH.10Spheniscidite(NH4,K)(Fe3+,Al)2(PO4)2(OH) · 2H2O
8.DH.10TinsleyiteKAl2(PO4)2(OH) · 2H2O
8.DH.15Jahnsite-(CaMnFe){Ca}{Mn2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMg){Ca}{Mn2+}{(Mg,Fe2+)2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMnMn){Ca}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15KeckiteCaMn2+Fe23+Fe23+(PO4)4(OH)3(H2O)7
8.DH.15Rittmannite{(Mn2+,Ca)}{Mn2+}{(Fe2+,Mn2+,Mg)2}{(Al,Fe3+)2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaFeMg){Ca}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(CaMnMg){Ca}{Mn2+}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Whiteite-(MnFeMg){(Mn2+,Ca)}{(Fe2+,Mn2+)}{Mg2}{Al2}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(MnMnMn){Mn2+}{Mn2+}{Mn22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Kaluginite(Mn2+,Ca)MgFe3+(PO4)2(OH) · 4H2O
8.DH.15Jahnsite-(CaFeFe){Ca}{Fe2+}{Fe22+}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaFeMg)NaFe3+Mg2Fe23+(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(NaMnMg){Na}{Mn3+}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.15Jahnsite-(CaMgMg){Ca}{Mg}{Mg2}{Fe23+}(PO4)4(OH)2 · 8H2O
8.DH.20Manganosegelerite(Mn2+,Ca)(Mn2+,Fe2+,Mg)Fe3+(PO4)2(OH) · 4H2O
8.DH.20OveriteCaMgAl(PO4)2(OH) · 4H2O
8.DH.20SegeleriteCa2 Mg2 Fe23+(PO4)4(OH)2 · 8H2O
8.DH.20WilhelmvierlingiteCaMnFe3+(PO4)2(OH) · 2H2O
8.DH.20JuonniiteCaMgSc(PO4)2(OH) · 4H2O
8.DH.25CalcioferriteCa2Fe23+(PO4)3(OH) · 7H2O
8.DH.25KingsmountiteCa4(Fe2+,Mn2+)Al4(PO4)6(OH)4 · 12H2O
8.DH.25MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
8.DH.25ZodaciteCa4Mn2+Fe43+(PO4)6(OH)4 · 12H2O
8.DH.30ArseniosideriteCa2Fe33+(AsO4)3O2 · 3H2O
8.DH.30KolfaniteCa2Fe33+O2(AsO4)3 · 2H2O
8.DH.30MitridatiteCa2Fe33+(PO4)3O2 · 3H2O
8.DH.30PararobertsiteCa2Mn33+(PO4)3O2 · 3H2O
8.DH.30RobertsiteCa3Mn43+(PO4)3O2 · 3H2O
8.DH.30Sailaufite(Ca,Na,☐)2Mn33+(AsO4)2(CO3)O2 · 3H2O
8.DH.35MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O
8.DH.35Benyacarite(H2O,K)2(Mn2+,Fe2+)2(Fe3+,Ti)2Ti(PO4)4(O,F)2 · 14H2O
8.DH.40XanthoxeniteCa4Fe23+(PO4)4(OH)2 · 3H2O
8.DH.45MahnertiteNaCu3(AsO4)2Cl · 5H2O
8.DH.50AndyrobertsiteKCdCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.50CalcioandyrobertsiteKCaCu5(AsO4)4(H2AsO4) · 2H2O
8.DH.55EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
8.DH.60BouazzeriteBi6(Mg,Co)11Fe143+(AsO4)18(OH)4O12 · 86H2O
19.8.1MontebrasiteLiAl(PO4)(OH)
19.8.2BrazilianiteNaAl3(PO4)2(OH)4
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2O
19.8.4TancoiteLiNa2Al(PO4)(HPO4)(OH)
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2O
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2O
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2O
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2O
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2O
19.8.11OveriteCaMgAl(PO4)2(OH) · 4H2O
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2O
19.8.14FoggiteCaAl(PO4)(OH)2 · H2O
19.8.15GatumbaiteCaAl2(PO4)2(OH)2 · H2O
19.8.16CrandalliteCaAl3(PO4)(PO3OH)(OH)6
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
19.8.19Lehiite
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2O
19.8.21EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2O
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2O
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2O

Other Names for Paulkerrite

Name in Other Languages:

Other Information

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 Paulkerrite

Reference List:
American Mineralogist (1985): 70: 875.

Peacor, Donald R., Dunn, Pete J., and Simmons, William, 1984, Paulkerrite, a New Titanium Phosphate from Arizona, Mineralogical Record: 15: 303-306.

Canadian Mineralogist (1997): 35: 707-712.

Schnorrer, G. & Tetzer, G. (2005): Paulkerrite, K(Mg,Mn)2Fe2Ti[(OH)3|(PO4)4]×15H2O from Folgosinho quarry in Portugal, an additional locality for this rare compound. Aufschluss 56, 258-260. (in German).

Internet Links for Paulkerrite

Localities for Paulkerrite

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.
(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.
Czech Republic
 
  • Moravia (Mähren; Maehren)
    • Vysočina Region
      • Žďár nad Sázavou
Staněk, J.: Parageneze minerálů pegmatitových žil z Hatí u Dolních Borů na západní Moravě. Acta Mus. Moraviae, Sci. nat., vol. 76, pages 19-49.
Staněk, J.: Asociace minerálů významnějších pegmatitových žil v Hatích u Dolních Borů na západní Moravě. Acta Musei Moraviae, Scientiae naturales, 1997, roč. 82, 3-19.
Morocco
 
  • Marrakech-Tensift-El Haouz Region
    • El Kelaâ des Sraghna Province
      • Sidi Bou Othmane
Favreau, G. (2012): Deux pegmatites à phosphates de Sidi Bou Othmane (Maroc). Le Cahier des Micromonteurs, 3-2012, 71-109.
Portugal
 
  • Guarda District
    • Gouveia
      • Folgosinho
Schnorrer, G. & Tetzer, G. (2005): Paulkerrite, K(Mg,Mn)2Fe2Ti[(OH)3|(PO4)4]×15H2O from Folgosinho quarry in Portugal, an additional locality for this rare compound. Aufschluss 56, 258-260. (in German)
Lapis 15(7/8), 12 (1990)
    • Sabugal
      • Bendada
Schnorrer-Köhler (1991), Mineral Occurrences.
USA (TL)
 
  • Arizona
    • Yavapai Co.
      • Eureka District
        • Hillside
          • Bagdad Mine area
Peacor, D., et al., Paulkerrite, a new titanium phosphate from AZ, Min.Rec.: 15: 303-307(1984); Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 323
Mineral and/or Locality  
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