Mineralogy Database

Paulkerrite Mineral Data

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General Paulkerrite Information

Help on Chemical  Formula: Chemical Formula: K(Mg,Mn)2(Fe+++,Al)2Ti(PO4)4(OH)3•15(H2O)
Help on Composition: Composition: Molecular Weight = 970.02 gm
   Potassium    3.63 %  K     4.37 % K2O
   Magnesium    2.76 %  Mg    4.57 % MgO
   Titanium     5.92 %  Ti    9.88 % TiO2
   Manganese    5.66 %  Mn    7.31 % MnO
   Aluminum     0.83 %  Al    1.58 % Al2O3
   Iron         8.64 %  Fe   12.35 % Fe2O3
   Phosphorus  12.77 %  P    29.27 % P2O5
   Hydrogen     3.39 %  H    30.27 % H2O
   Oxygen      55.42 %  O
   Fluorine     0.98 %  F     0.98 % F
                 -   %   F    -0.41 % -O=F2    
              ______        ______ 
              100.00 %      100.16 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.9Mg1.1Mn2+Fe3+1.5Al0.3Ti1.2(PO4)4(OH)2.6F0.5�15(H2O)
Help on Environment: Environment: An alteration product of triplite in complexly zoned granite pegmatites.
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: At the 7U7 Ranch, 40 km west of Hillside, Bagdad district, Yavapai County, Arizona, USA. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Paul Francis Kerr (1897-1981), Professor of Mineralogy, Columbia University, New York City, New York, USA.
Help on Name Pronunciation: Name Pronunciation: Paulkerrite + Pronunciation Say PAULKERRITE

Paulkerrite Image

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Comments: Transparent yellow tabular paulkerrite microcrystal.
Location: Folgosinho, Guarda, Portugal. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Paulkerrite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5055:1:0.5995
Help on Cell Dimensions: Cell Dimensions: a = 10.49, b = 20.75, c = 12.44, Z = 4; V = 2,707.78 Den(Calc)= 2.38
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P bca
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 6.2(1), 10.3(0.9), 7.46(0.8),

Physical Properties of Paulkerrite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Colorless, Yellow brown, Light yellow brown.
Help on Density: Density: 2.36
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Hardness: Hardness: 3 - Calcite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: yellow white

Optical Properties of Paulkerrite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.03 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.038 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2598,KPDmeas= 0.262,KC= 0.27
Ncalc = 1.64
Help on Optical Data: Optical Data: Biaxial (-), a=1.591-1.598, b=1.615-1.624, g=1.639-1.643, bire=0.0450-0.0480, 2V(Calc)=78-88, 2V(Meas)=80. Dispersion r > v strong.

Calculated Properties of Paulkerrite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.39 gm/cc
note: Specific Gravity of Paulkerrite =2.36 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPaulkerrite = 5.95 barns/electron
U=PEPaulkerrite x relectron= 14.21 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 52.93 (Gamma Ray American Petroleum Institute Units)
Concentration of Paulkerrite per GRapi unit = 1.89 (%)

Estimated Radioactivity from Paulkerrite - barely detectable


Paulkerrite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.21)Paulkerrite Group Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na21 Ortho Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.DH.35 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1
08.DH.35 Benyacarite (H2O,K)2Ti(Mn,Fe)2(Fe,Ti)2Ti(PO4)4(O,F)2•14(H2O) P bca 2/m 2/m 2/m
08.DH.35 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na21 Ortho
08.DH.35 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m
08.DH.35 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

Other Paulkerrite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Paulkerrite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DH.35





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