| Reference Type | Journal (article/letter/editorial) |
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| Title | Tomsquarryite, NaMgAl3(PO4)2(OH)6 ⋅ 8H2O, a new crandallite-derivative mineral from Tom's phosphate quarry, Kapunda, South Australia |
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| Journal | European Journal of Mineralogy | ISSN | 0935-1221 |
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| Authors | Elliott, Peter | Author |
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| Grey, Ian E. | Author |
| Mumme, William G. | Author |
| MacRae, Colin M. | Author |
| Kampf, Anthony R. | Author |
| Year | 2022 (August 17) | Volume | 34 |
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| Issue | 4 |
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| Publisher | Copernicus GmbH |
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| URL | |
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| Download URL | https://ejm.copernicus.org/articles/34/375/2022/ejm-34-375-2022.pdf+ |
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| DOI | doi:10.5194/ejm-34-375-2022Search 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 | 16879350 | Long-form Identifier | mindat:1:5:16879350:3 |
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| GUID | 0 |
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| Full Reference | Elliott, Peter, Grey, Ian E., Mumme, William G., MacRae, Colin M., Kampf, Anthony R. (2022) Tomsquarryite, NaMgAl3(PO4)2(OH)6 ⋅ 8H2O, a new crandallite-derivative mineral from Tom's phosphate quarry, Kapunda, South Australia. European Journal of Mineralogy, 34 (4) 375-383 doi:10.5194/ejm-34-375-2022 |
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| Plain Text | Elliott, Peter, Grey, Ian E., Mumme, William G., MacRae, Colin M., Kampf, Anthony R. (2022) Tomsquarryite, NaMgAl3(PO4)2(OH)6 ⋅ 8H2O, a new crandallite-derivative mineral from Tom's phosphate quarry, Kapunda, South Australia. European Journal of Mineralogy, 34 (4) 375-383 doi:10.5194/ejm-34-375-2022 |
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| In | (2022) European Journal of Mineralogy Vol. 34 (4) Schweizerbart |
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| Abstract/Notes | Tomsquarryite, NaMgAl3(PO4)2(OH)6 ⋅ 8H2O, is a new secondary phosphate mineral from Tom's phosphate quarry, Kapunda, South Australia. It occurs as colourless, talc-like hexagonal platelets, with diameters of a few tens of micrometres when formed from the decomposition of minyulite and as thicker (∼ 10 µm) hexagonal crystals when formed from alteration of gordonite. Associated minerals are penriceite, elliottite, minyulite, angastonite and wavellite. The calculated density is 2.22 g cm−3. Tomsquarryite crystals are uniaxial (+) with ω=1.490(3), ε=1.497(3) (white light). Dispersion was not observed. The partial orientation is Z≈c. Electron microprobe analyses of the holotype specimen give the empirical formula Na1.02K0.02Ca0.08Mg1.26Al2.86(PO4)2.00(OH)3.82F2.48 ⋅ 7.70H2O, based on 22 anions. Tomsquarryite belongs to the trigonal crystal system, space group R–3m, with hexagonal unit-cell parameters a=6.9865(5) Å, c=30.634(3) Å and V=1294.9(4) Å3 and with Z=3. The crystal structure was refined using single-crystal diffraction data; R1=0.069 for 303 reflections with I>2σ(I) to a resolution of 0.80 Å. The crystal structure is a derivative of the crandallite structure, with Ca2+ cations replaced by hydrated magnesium ions, [Mg(H2O)6]2+, resulting in an expansion of the interlayer separation from 5.4 Å in crandallite to 10.2 Å in tomsquarryite. The results for tomsquarryite are compared with those for the chemically and structurally related minerals penriceite and elliottite. |
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