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Wooldridgeite

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About WooldridgeiteHide

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 mineral.
The second diphosphate (pyrophosphate) to be discovered, very unusual in nature. May not be natural.


Classification of WooldridgeiteHide

Approved
Approval Year:
1997
First Published:
1999
8.FC.25

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

Physical Properties of WooldridgeiteHide

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

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
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
none
Pleochroism:
Non-pleochroic

Chemical Properties of WooldridgeiteHide

Formula:
Na2CaCu2+2(P2O7)2 · 10H2O

Crystallography of WooldridgeiteHide

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, somtimes with subtly curved faces.

X-Ray Powder DiffractionHide

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

Type Occurrence of WooldridgeiteHide

General Appearance of Type Material:
Pale-blue crystals up to 2 mm across
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:
Reference:
Hawthorne F C, Cooper M A, Green D I, Starkey R E, Roberts A C, Grice J D (1999) Wooldridgeite, Na2CaCu22+(P2O7)2(H2O)10: a new mineral from Judkins Quarry, Warwickshire, England. Mineralogical Magazine: 63: 13-16

Synonyms of WooldridgeiteHide

Other Language Names for WooldridgeiteHide

Common AssociatesHide

Associated Minerals Based on Photo Data:
Calcite2 photos of Wooldridgeite associated with Calcite on mindat.org.
Yarrowite2 photos of Wooldridgeite associated with Yarrowite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.FC.05FianeliteMn2+2((V,As)2O7) · 2H2OMon.
8.FC.10CanaphiteNa2Ca(P2O7) · 4H2OMon.
8.FC.15PintadoiteCa2(V2O7) · 9H2O
8.FC.20Arnhemite(K,Na)4Mg2(P2O7)2 · 5H2OHex.
8.FC.30KanoneroviteNa3Mn2+(P3O10) · 12H2OMon. 2/m

Other InformationHide

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

References for WooldridgeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Canadian Mineralogist (1999): 37: 73-81.
Hawthorne F C, Cooper M A, Green D I, Starkey R E, Roberts A C, Grice J D (1999) Wooldridgeite, Na2CaCu22+(P2O7)2(H2O)10: a new mineral from Judkins Quarry, Warwickshire, England. Mineralogical Magazine: 63: 13-1

Internet Links for WooldridgeiteHide

Localities for WooldridgeiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
UK
 
  • England
    • Cumbria
      • Allerdale
        • Caldbeck
          • Roughton Gill
Cooper, M.P. and Stanley, C.J. (1990) Minerals of the English Lake District: Caldbeck Fells. Natural History Museum Publications, London, 160 pp.; Bridges, T.F., Green, D., Rumsey, M.S., and Leppington, C.M. (2011) A review of the mineralisation of the Roughton Gill mines, Caldbeck Fells, Cumbria: Part 3 Roughton Gill Mine. Journal of the Russell Society, 14, 3-23 (referring to Cooper & Stanley, 1990).
    • Warwickshire
      • Nuneaton and Bedworth
Hawthorne et al. (1999): Wooldridgeite, Na2CaCu22+(P2O7)2(H2O)10: A New Mineral from Judkins Quarry, Warwickshire, England. Mineralogical Magazine,63: 13-16
Mineral and/or Locality  
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