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 % Na2 O
Calcium 5.41 % Ca 7.57 % CaO
Copper 17.15 % Cu 21.46 % CuO
Phosphorus 16.72 % P 38.30 % P2 O5
Hydrogen 2.72 % H 24.31 % H2 O
Oxygen 51.81 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Na2 CaCu2 (P2 O7 )2 •10(H2 O)
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 - Pyramidal H-M Symbol (mm2) Space Group: F dd2
X Ray Diffraction:
By Intensity(I/Io ): 6.52(1), 3.255(0.4), 4.05(0.4),
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:
PEWooldridgeite = 8.82 barns/electronU=PEWooldridgeite x r Electron 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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Wooldridgeite
Na2CaCu++2(P2O7)2•10(H2O)
Dana No: 40.05.14.01 Strunz No: 08.FC.25
Locality:
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