Wooldridgeite Mineral Data

General Wooldridgeite Information

Chemical Formula:

Na2CaCu++2(P2O7)2•10(H2O)

Composition:

Molecular Weight = 741.19 gm

Sodium 6.20 % Na 8.36 % Na₂O

Calcium 5.41 % Ca 7.57 % CaO

Copper 17.15 % Cu 21.46 % CuO

Phosphorus 16.72 % P 38.30 % P₂O₅

Hydrogen 2.72 % H 24.31 % H₂O

Oxygen 51.81 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂CaCu₂(P₂O₇)₂•10(H₂O)

Environment:

Along fractures in Cambrian sedimentary rocks above an unconformity.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Found in the Judkins quarry, Nuneaton, Warwickshire, U.K. Link to MinDat.org Location Data.

Name Origin:

Named after James Wooldridge (1923-1995), keen amateur mineralogist, micromounter and gemologist from Fernhill Heath, Worcestershire, U.K., who discovered the mineral.

Name Pronunciation:

Wooldridgeite + Pronunciation

Synonym:

IMA1997-037

Woolridgeite - Mineral name error corrected to wooldridgeite

Wooldridgeite Image

Images:

Wooldridgeite

Comments: SEM image of crystalline aggregates of wooldridgeite showing rhombic dipyramidal forms, (MinMag, v63:13).
Location: Judkins Quarry, Nuneaton, Warwickshire, England. Scale: Scale Bar 100 µm.
© Mineralogical Magazine

Wooldridgeite Crystallography

Axial Ratios:

a:b:c =0.3633:1:0.3353

Cell Dimensions:

a = 11.938, b = 32.854, c = 11.017, Z = 8; V = 4,320.99 Den(Calc)= 2.28

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: F dd2

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

By Intensity(I/I_o): 6.52(1), 3.255(0.4), 4.05(0.4),

Crystal Structure:

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Cooper M A , Hawthorne F C , The Canadian Mineralogist , 37 (1999) p.73-81, The crystal structure of wooldridgeite, Na2CaCu2(P2O7)2(H2O)10,, a novel copper pyrophosphate mineral

Physical Properties of Wooldridgeite

Cleavage:

None

Color:

Greenish blue.

Diaphaneity:

Transparent

Fracture:

Brittle - Irregular - Very brittle fracture producing irregular fragments

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

2-3 - Gypsum-Calcite

Luster:

Vitreous (Glassy)

Streak:

very pale blue

Optical Properties of Wooldridgeite

Gladstone-Dale:

CI calc= -0.016 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2246,KC= 0.221
Ncalc = 1.5

Optical Data:

Biaxial (+), a=1.508, b=1.511, g=1.517, bire=0.0090, 2V(Calc)=72, 2V(Meas)=76.2. Dispersion none.

Calculated Properties of Wooldridgeite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Wooldridgeite =2.28 gm/cc.

Fermion Index:

Fermion Index = 0.0003257499
Boson Index = 0.9996742501

Photoelectric:

PE_{Wooldridgeite}= 8.82 barns/electron
U=PE_{Wooldridgeite} x rElectron Density= 20.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Wooldridgeite is Not Radioactive

Wooldridgeite Classification

Dana Class:

40.05.14.01 (40)Hydrated Phosphates, etc

(40.05)with miscellaneous formulae

(40.05.14)Dana Group

40.05.14.01 Wooldridgeite! Na2CaCu2(P2O7)2•10(H2O) F dd2 mm2

Strunz Class:

08.FC.25 08 - PHOSPHATES, ARSENATES, VANADATES

08.F - Polyphosphates, Polyarsenates, [4]-Polyvanadates

08.FC -Polyphosphates, etc., with H2O only

08.FC.25 Wooldridgeite! Na2CaCu2(P2O7)2•10(H2O) F dd2 mm2

Other Wooldridgeite Information

References:

NAME( CanMin, 8/99) PHYS. PROP.(Eur. J. Min.,Vol.10,1998) OPTIC PROP.(MinRec, V 31, No. 2)

See Also:

Links to other databases for Wooldridgeite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Print or Cut-and-Paste your Wooldridgeite Specimen Label here :

Wooldridgeite

Na2CaCu++2(P2O7)2•10(H2O)
Dana No: 40.05.14.01 Strunz No: 08.FC.25
Locality:

Notes: