Ushkovite Mineral Data

Ushkovite Mineral Data +

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General Ushkovite Information

Chemical Formula:

MgFe+++2(PO4)2(OH)2·8(H2O)

Composition:

Molecular Weight = 504.08 gm

Magnesium 4.82 % Mg 8.00 % MgO

Iron 22.16 % Fe 31.68 % Fe₂O₃

Phosphorus 12.29 % P 28.16 % P₂O₅

Hydrogen 3.60 % H 32.17 % H₂O

Oxygen 57.13 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

MgFe³⁺₂(PO₄)₂(OH)₂·8(H₂O)

IMA Status:

Approved IMA 1983

Locality:

Link to MinDat.org Location Data.

Ushkovite Image

Images:

Ushkovite Roscherite

Comments: Translucent ushkovite microcrystals with orange roscherite on feldspar.
Location: Galileia, Minas Gerais, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Ushkovite Crystallography

Axial Ratios:

a:b:c =0.4859:1:0.6672

Cell Dimensions:

a = 5.2, b = 10.7, c = 7.14, Z = 1; alpha = 108.6°, beta = 106.933°, gamma = 72.717° V = 343.93 Den(Calc)= 2.43

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 9.86(1), 3.2(0.8), 6.57(0.8),

Crystal Structure:

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Galliski M A , Hawthorne F C , The Canadian Mineralogist , 40 (2002) p.929-937, Refinement of the crystal structure of ushkovite from Nevados De Palermo,, Republica Argentina, Locality: Nevados De Palermo, Republica Argentina

Physical Properties of Ushkovite

Cleavage:

[010] Perfect

Color:

Brown, Light yellow, Orange.

Density:

2.38

Diaphaniety:

Transparent

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

white

Optical Properties of Ushkovite

Gladstone-Dale:

CI meas= 0.043 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2594,KPDmeas= 0.2648,KC= 0.2767

Optical Data:

Biaxial (-), a=1.584, b=1.637, g=1.67, bire=0.0860, 2V(Calc)=74, 2V(Meas)=50.

Calculated Properties of Ushkovite

Electron Density:

r_electron=2.42 gm/cc
note: r_Ushkovite=2.38 gm/cc.

Fermion Index

Fermion Index = 0.00979
Boson Index = 0.99021

Photoelectric:

PE_Ushkovite= 7.15 barns/electron
U=PE_Ushkovite x r_electron= 17.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ushkovite is Not Radioactive

Ushkovite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.10)Dana Group

42.11.10.1 Laueite MnFe2(PO4)2(OH)2·8(H2O) P1 1

42.11.10.2 Stewartite MnFe2(PO4)2(OH)2·8(H2O) P1 1

42.11.10.3 Pseudolaueite MnFe2(PO4)2(OH)2·7-8(H2O) P 2₁/a 2/m

42.11.10.4 Ushkovite MgFe2(PO4)2(OH)2·8(H2O) P1 1

42.11.10.5 Ferrolaueite! FeFe2(PO4)2(OH)2·8(H2O) Tri

Strunz Class:

VII/D.10-20 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.10 - Paravauxite group

VII/D.10-10 Gordonite MgAl2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-20 Ushkovite MgFe2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-30 Paravauxite FeAl2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-35 Mangangordonite (Mn,Fe,Mg)Al2(PO4)2(OH)2·8(H2O) P1 1

VII/D.10-40 Sigloite FeAl2(PO4)2(OH)3·5(H2O) P1 1

VII/D.10-45 Ferrolaueite! FeFe2(PO4)2(OH)2·8(H2O) Tri

VII/D.10-50 Laueite MnFe2(PO4)2(OH)2·8(H2O) P1 1

Other Ushkovite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Ushkovite :
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 -École des Mines de Paris

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Ushkovite

MgFe+++2(PO4)2(OH)2·8(H2O)
Dana No: 42.11.10.4 Strunz No: VII/D.10-20
Locality:

Notes: