Paulkerrite Mineral Data

General Paulkerrite Information

Chemical Formula: K(Mg,Mn)2(Fe+++,Al)2Ti(PO4)4(OH)3•15(H2O) 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 Empirical Formula: K_0.9Mg_1.1Mn²⁺Fe³⁺_1.5Al_0.3Ti_1.2(PO₄)₄(OH)_2.6F_0.5·15(H₂O) Environment: An alteration product of triplite in complexly zoned granite pegmatites. IMA Status: Approved IMA 1984 Locality: At the 7U7 Ranch, 40 km west of Hillside, Bagdad district, Yavapai County, Arizona, USA. Link to MinDat.org Location Data. Name Origin: Named after Paul Francis Kerr (1897-1981), Professor of Mineralogy, Columbia University, New York City, New York, USA. Name Pronunciation: Paulkerrite + Pronunciation  

Paulkerrite Image

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Paulkerrite Crystallography

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

Physical Properties of Paulkerrite

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

Optical Properties of Paulkerrite

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 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

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

Dana Class: 42.11.21.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen   (42.11)where (AB)4 (XO4)3 Zq · x(H2O)   (42.11.21)Paulkerrite Group  

42.11.21.01 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

 

42.11.21.02 Mantienneite KMg2Al2Ti(PO4)4(OH)3•15(H2O) P bca 2/m 2/m 2/m

 

42.11.21.03 Matveevite? KTiMn2Fe2(PO4)4(OH)3•15(H2O) Pnam ro P na2₁ Ortho

 

42.11.21.04 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

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

References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4) 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
15 - WWW-MINCRYST
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