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⇱ Wooldridgeite: Mineral information, data and localities.

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Wooldridgeite

A valid IMA mineral species
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About WooldridgeiteHide

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Formula:
Na2CaCu2+2(P2O7)2 · 10H2O
Colour:
Blue-green
Lustre:
Vitreous
Hardness:
2 - 3
Specific Gravity:
2.279 (Calculated)
Crystal System:
Orthorhombic
Name:
Named after James Wooldridge (1923-1995), keen amateur mineralogist, micromounter and gemologist from Fernhill Heath, Worcestershire, U.K., who discovered the material.
The second diphosphate (pyrophosphate) to be discovered, probably a post-mining/post-collecting anthropogenic alteration.

Synthetic woooldridgeite can be made simply using a solution of copper and calcium ions to which the commercial pyrophospate-based cleaning agent 'calgon' - used by collectors to remove clay minerals from specimen - has been added, and it is quite possible that the material from the type locality may have been cleaned using such a compound by the original collector.

Compare canaphite, anastasenkoite; canaphite; 'pyrophosphite', 'pyrocoproite', and 'arnhemite'.

See also UM1991-10-PO:BaCaHMgSr.


Unique IdentifiersHide

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Mindat ID:
7371
Long-form identifier:
mindat:1:1:7371:0

IMA Classification of WooldridgeiteHide

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Approved
Approval year:
1997
First published:
1999
Approval history:
Note that the type material may be anthropogenic .

Classification of WooldridgeiteHide

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8.FC.25

8 : PHOSPHATES, ARSENATES, VANADATES
F : Polyphosphates, Polyarsenates, [4]-Polyvanadates
C : Polyphosphates, etc., with H2O only

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
WooIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of WooldridgeiteHide

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Vitreous
Transparency:
Transparent
Colour:
Blue-green
Streak:
Very pale blue
Hardness:
2 - 3 on Mohs scale
Density:
2.279 g/cm3 (Calculated)

Optical Data of WooldridgeiteHide

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Type:
Biaxial (+)
RI values:
nα = 1.508(1) nβ = 1.511(1) nγ = 1.517(1)
2V:
Measured: 76° , Calculated: 72°
Max. Birefringence:
δ = 0.009
Based on recorded range of RI values above.

Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.

Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.

Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.

Surface Relief:
Moderate
Dispersion:
none
Pleochroism:
Non-pleochroic

Chemistry of WooldridgeiteHide

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Mindat Formula:
Na2CaCu2+2(P2O7)2 · 10H2O
Element Weights:
Element% weight
O51.807 %
Cu17.147 %
P16.716 %
Na6.204 %
Ca5.407 %
H2.720 %

Calculated from ideal end-member formula.

Crystallography of WooldridgeiteHide

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Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Fdd2
Cell Parameters:
a = 11.938(1) Å, b = 32.854(2) Å, c = 11.017(1) Å
Ratio:
a:b:c = 0.363 : 1 : 0.335
Unit Cell V:
4321.2 ų
Z:
8
Morphology:
Crystals have a rhombic-dipyramidal form, sometimes with subtly curved faces.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0005593WooldridgeiteCooper M A, Hawthorne F C (1999) The crystal structure of wooldridgeite, Na2CaCu2(P2O7)2(H2O)10, a novel copper pyrophosphate mineral The Canadian Mineralogist 37 73-81👁 Image
19990293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:
d-spacingIntensity
8.23 Å(30)
6.52 Å(100)
4.05 Å(40)
3.255 Å(40)
2. 924 Å(40)

Type Occurrence of WooldridgeiteHide

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General Appearance of Type Material:
Pale-blue crystals up to 2 mm across.
Place of Conservation of Type Material:
Manchester Museum, Manchester, England, N13200.
Empirical Formula of Type Material:
(Na1.96K0.03)Ca1.00(Cu1.85Mg0.04)P4.04O14(H2O)10
Chemical Analysis of Type Material:
P2O539.37 %
CuO20.24 %
CaO7.73 %
Na2O8.33 %
K2O0.17 %
MgO0.24 %
H2O (calc)24.72 %
Total:100.8 %
Associated Minerals at Type Locality:

Synonyms of WooldridgeiteHide

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Other Language Names for WooldridgeiteHide

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Common AssociatesHide

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Associations Based on Photo Data:
2 photos of Wooldridgeite associated with YarrowiteCu9S8
2 photos of Wooldridgeite associated with CalciteCaCO3
1 photo of Wooldridgeite associated with ChalcopyriteCuFeS2
1 photo of Wooldridgeite associated with CovelliteCuS
1 photo of Wooldridgeite associated with Tennantite SubgroupCu6(Cu4C2+2)As4S12S

Related Minerals - Strunz-mindat GroupingHide

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8.FC.DonowensiteCa(H2O)3Fe3+2(V2O7)2Tric. 1 : P1
8.FC.XHylbrowniteNa3Mg(P3O10) · 12H2O Mon. 2/m
8.FC.05FianeliteMn2+2((V,As)2O7) · 2H2OMon. 2/m
8.FC.05RüdlingeriteMn2+2V5+As5+O7 · 2H2OMon.
8.FC.10CanaphiteNa2Ca(P2O7) · 4H2OMon. m : Pb
8.FC.15PintadoiteCa2(V2O7) · 9H2O
8.FC.20'Arnhemite'(K,Na)4Mg2(P2O7)2 · 5H2OHex.
8.FC.30KanoneroviteNa3Mn2+(P3O10) · 12H2OMon. 2/m
8.FC.35MesaiteCaMn2+5(V2O7)3 · 12H2OMon. 2/m : P2/b

Other InformationHide

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Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for WooldridgeiteHide

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mindat.org URL:
https://www.mindat.org/min-7371.html
Please feel free to link to this page.

References for WooldridgeiteHide

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Reference List:

Localities for WooldridgeiteHide

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Showing 3 localities.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 👁 Image
symbol to view information about a locality. The 👁 Image
symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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👁 Image
- This locality has map coordinates listed. 👁 Image
- This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 👁 Image
- Good crystals or important locality for species. 👁 Image
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Germany
  • Baden-Württemberg
    • Freiburg Region
      • Ortenaukreis
        • Oberwolfach
Kolitsch et al. (2019)
UK
  • England
    • Cumbria
      • Allerdale
        • Caldbeck
          • Roughton Gill
Cooper et al. (1990) +1 other reference
    • Warwickshire
      • Nuneaton and Bedworth
Hawthorne et al. (1999)
Quick NavTopAbout WooldridgeiteUnique IdentifiersIMA Classification Classification Mineral SymbolsPhysical Properties Optical Data Chemistry Crystallography Crystal StructureX-Ray Powder DiffractionType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
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