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_0.5ï¿½15(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

Images:

Paulkerrite

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

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 - 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/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 ï¿½ 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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Paulkerrite

K(Mg,Mn)2(Fe+++,Al)2Ti(PO4)4(OH)3•15(H2O)
Dana No: 42.11.21.01 Strunz No: 08.DH.35
Locality:

Notes:

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