| Reference Type | Journal (article/letter/editorial) |
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| Title | Wooldridgeite, Na2CaCu2+2(P2O7)2(H2O)10: A new mineral from Judkins Quarry, Warwickshire, England |
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| Journal | Mineralogical Magazine | ISSN | 0026-461X |
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| Authors | Hawthorne, F. C. | Author |
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| Cooper, M. A. | Author |
| Green, D. I. | Author |
| Starkey, R. E. | Author |
| Roberts, A. C. | Author |
| Grice, J. D. | Author |
| Year | 1999 (February) | Volume | 63 |
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| Issue | 1 |
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| Publisher | Mineralogical Society |
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| Download URL | https://rruff.info/doclib/MinMag/Volume_63/63-1-13.pdf+ |
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| DOI | doi:10.1180/002646199548268Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 1255 | Long-form Identifier | mindat:1:5:1255:7 |
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| GUID | 0 |
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| Full Reference | Hawthorne, F. C., Cooper, M. A., Green, D. I., Starkey, R. E., Roberts, A. C., Grice, J. D. (1999) Wooldridgeite, Na2CaCu2+2(P2O7)2(H2O)10: A new mineral from Judkins Quarry, Warwickshire, England. Mineralogical Magazine, 63 (1) 13-16 doi:10.1180/002646199548268 |
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| Plain Text | Hawthorne, F. C., Cooper, M. A., Green, D. I., Starkey, R. E., Roberts, A. C., Grice, J. D. (1999) Wooldridgeite, Na2CaCu2+2(P2O7)2(H2O)10: A new mineral from Judkins Quarry, Warwickshire, England. Mineralogical Magazine, 63 (1) 13-16 doi:10.1180/002646199548268 |
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| Abstract/Notes | Wooldridgeite, ideally Na2(P2O7)2(H2O)10, orthorhombic, a = 11.938(1), b = 32.854(2), c = 11.017(1) Å , V = 4321.2(8) Å3, a:b:c = 0.3634:1:0.3353, space group Fdd2, Z = 8, is a new mineral from Judkins Quarry, Nuneaton, Warwickshire, England. Associated minerals are calcite, chalcopyrite, bornite and baryte. It occurs as equant crystals forming rhombic dipyramids; no twinning was observed. It is transparent blue-green with a very pale-blue streak, a vitreous lustre, and does not fluoresce under long- or short-wave ultraviolet light. Wooldridgeite has a Mohs hardness of 2–3, is brittle with an irregular fracture, and has no cleavage. The calculated density is 2.279 g/cm3. In transmitted light, wooldridgeite is colourless, non-pleochroic, and shows no dispersion. It is biaxial negative with α = 1.508(1), β = 1.511(1), γ = 1.517(1), 2V(meas.) = 76.2(5), 2V(calc.) = 71(10)8, X = b, Y = c, Z = a. The strongest five reflections in the X-ray powder diffraction pattern are [d(Å), (I), (hkl)]: 8.23(30)(040), 6.52(100)(131), 4.05(40)(260), 3.255(40)(262); 2.924(40)(371). Electron-microprobe analysis of wooldridgeite gave P2O5 39.37, CuO 20.24, MgO 0.24, CaO 7.73, Na2O 8.33, K2O 0.17, H2O(calc.) 24.72, sum 100.80 wt.%; the corresponding unit formula (based on 24 anions) is (Na1.96K0.03)Ca1.00(Cu1.85Mg0.04)P4.04O14(H2O)10 where the H2O groups were assigned from knowledge of the crystal structure; the infrared absorption spectrum also indicates the presence of H2O in the structure. The mineral is named for James Wooldridge (1923–1995), a fervent amateur mineral collector who discovered this mineral. |
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