Paulkerrite Mineral Data

Paulkerrite Mineral Data +

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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.

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 - DipyramidalH-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

Diaphaniety:

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

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:

r_electron=2.39 gm/cc
note: r_Paulkerrite=2.36 gm/cc.

Fermion Index

Fermion Index = 0.01252
Boson Index = 0.98748

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)

Estimated Radioactivity from Paulkerrite - barely detectable

Paulkerrite Classification

Dana Class:

42.11.21.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.21)Dana Group

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

42.11.21.2 Mantienneite KMg2Al2Ti(PO4)4(OH)3·15(H2O) P bca 2/m 2/m 2/m

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

42.11.21.4 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:

VII/D.33-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of very big and medium size: Al, Mg and Ca, Na, K

VII/D.33 - Montgomeryite group, Mantienneite - Benyacarite series

VII/D.33-10 Mantienneite KMg2Al2Ti(PO4)4(OH)3·15(H2O) P bca 2/m 2/m 2/m

VII/D.33-20 Paulkerrite K(Mg,Mn)2(Fe,Al)2Ti(PO4)4(OH)3·15(H2O) P bca 2/m 2/m 2/m

VII/D.33-30 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

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Paulkerrite

K(Mg,Mn)2(Fe+++,Al)2Ti(PO4)4(OH)3·15(H2O)
Dana No: 42.11.21.1 Strunz No: VII/D.33-20
Locality:

Notes: