Mr John Spratt

Mr John Spratt

Electron Probe Microanalyst

Department: Core Research Laboratories
Division: Imaging and Analysis Centre
Contact: email


EDX, Electron Probe Microanalysis, Energy dispersive X-ray spectroscopy, WDX, Wavelength dispersive X-ray spectroscopy


Areas of responsibilities: Cameca SX100 electron microprobe. The determination by electron probe microanalysis of elemental composition in regard to mineral and synthetic materials. Spatial mapping of element concentration. Philosophy for collection, compilation, and statistical reporting of microprobe data. Training and supervision of users. Undertake research projects in collaboration with Museum and external workers. Undertake contract work.


Bell K, Zaitsev AN, Spratt J, Frodjo S, Rukhlova AS (2015) Elemental, lead and sulfur isotopic compositions of galena from Kola carbonatites, Russia – implications for melt and mantle evolution.. Mineralogical magazine, 79 (2): 219 - 241. doi: 10.1180/minmag.2015.079.2.01

Cooper AF, Collins AK, Palin JM, Spratt J (2015) Mineralogical evolution and REE mobility during crystallisation of ancylite-bearing ferrocarbonatite, Haast River, New Zealand. Lithos, : 324 - 337. doi: 10.1016/j.lithos.2015.01.005

Zaitsev AN, Williams CT, Jeffries TE, Strekopytov S, Moutte J, Ivashchenkova OV, Spratt J, Petrov SV, Wall F, Seltmann R, Borozdin AP (2015) Reprint of "Rare earth elements in phoscorites and carbonatites of the Devonian Kola Alkaline Province, Russia: Examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes". ORE GEOLOGY REVIEWS, 64 : 477 - 498. doi: 10.1016/j.oregeorev2014.06.004

Zaitsev AN, Terry Williams C, Jeffries TE, Strekopytov S, Moutte J, Ivashchenkova OV, Spratt J, Petrov SV, Wall F, Seltmann R, Borozdin AP (2014) Rare earth elements in phoscorites and carbonatites of the Devonian Kola Alkaline Province, Russia: Examples from Kovdor, Khibina, Vuoriyarvi and Turiy Mys complexes. Ore Geology Reviews, 61 : 204 - 225. doi: 10.1016/j.oregeorev.2014.02.002

Rumsey MS, Welch MD, Kampf AR, Spratt J (2013) Diegogattaite, Na2CaCu2Si8O20 center dot H2O: a new nanoporous copper sheet silicate from Wessels Mine, Kalahari Manganese Fields, Republic of South Africa. MINERALOGICAL MAGAZINE, 77 (8): 3155 - 3162. doi: 10.1180/minmag.2013.077.8.09

Zaitsev AN, Avdontseva EY, Britvin SN, Demeny A, Homonnay Z, Jeffries TE, Keller J, Krivovichev VG, Markl G, Platonova NV, Siidra OI, Spratt J, Vennemann T (2013) Oxo-magnesio-hastingsite, NaCa2(Mg2Fe33+)(Al2Si6)O22O2, a new anhydrous amphibole from the Deeti volcanic cone, Gregory rift, northern Tanzania. Mineralogical Magazine, 77 (6): 2773 - 2792. doi: 10.1180/minmag.2013.077.6.06

Siidra OI, Krivovichev SV, Turner RW, RUMSEY MS, SPRATT J (2013) Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part II. Crystal structure of vladkrivovichevite, Pb32O18 Pb4Mn2O Cl-14(BO3)(8)center dot 2H(2)O. American Mineralogist, 98 (1): 256 - 261. doi: 10.2138/am.2013.4244

Siidra OI, Krivovichev SV, Turner RW, RUMSEY MS, Spratt J (2013) Crystal chemistry of layered Pb oxychloride minerals with PbO-related structures: Part I. Crystal structure of hereroite, Pb32O20(O,square) (AsO4)(2) (Si,As,V,Mo)O-4 (2)Cl-10. American Mineralogist, 98 (1): 248 - 255. doi: 10.2138/am.2013.4241

ZAITSEV AN, Marks MAW, Wenzel T, SPRATT J, Sharygin VV, STREKOPYTOV S, Markl G (2012) Mineralogy, geochemistry and petrology of the phonolitic to nephelinitic Sadiman volcano, Crater Highlands, Tanzania. Lithos, 152 : 66 - 83. doi: 10.1016/j.lithos.2012.03.001

Kampf AR, Mills SJ, RUMSEY MS, Dini M, Birch WD, SPRATT J, Pluth JJ, Steele IM, Jenkins RA, Pinch WW (2012) The heteropolymolybdate family: structural relations, nomenclature scheme and new species. Mineralogical Magazine, 76 (5): 1175 - 1207. doi: 10.1180/minmag.2012.076.5.09

Turner RW, Siidra OI, Krivovichev SV, STANLEY CJ, SPRATT J (2012) Rumseyite, [Pb2OF]Cl, the first naturally occurring fluoroxychloride mineral with the parent crystal structure for layered lead oxychlorides. Mineralogical Magazine, 76 (5): 1247 - 1255. doi: 10.1180/minmag.2012.076.5.11

MÜLLER A, KEARSLEY A, SPRATT J, SELTMANN R (2012) Petrogenetic implications of magmatic garnet in granitic pegmatites from southern Norway. The Canadian Mineralogist, 50 (4): 1095 - 1115. doi: 10.3749/canmin.50.4.1095

Turner R, Siidra OI, RUMSEY MS, Krivovichev SV, STANLEY CJ, SPRATT J (2012) Hereroite and vladkrivovichevite: two novel lead oxychlorides from the Kombat mine, Namibia. Mineralogical Magazine, 76 (4): 883 - 890. doi: 10.1180/minmag.2012.076.4.05

Kampf AR, Mills SJ, RUMSEY MS, SPRATT J, Favreau G (2012) The crystal structure determination and redefinition of matulaite, Fe3+Al7(PO4)4(PO3OH)2(OH)8(H2O)8•8H2O. Mineralogical Magazine, 76 (3): 517 - 534. doi: 10.1180/minmag.2012.076.3.05

RUMSEY MS, Krivovichev S, Siidra OI, KIRK CA, STANLEY CJ, SPRATT J (2012) Rickturnerite, Pb7O4[Mg(OH)4](OH)Cl3, a complex new lead oxychloride mineral. Mineralogical Magazine, 76 (1): 59 - 73. doi: 10.1180/minmag.2012.076.1.59

Kampf AR, Mills SJ, Housley RM, RUMSEY MS, SPRATT J (2012) Lead-tellurium oxysalts from Otto Mountain near Baker, California: VII. Chromschieffelinite, Pb10Te6O20(OH)14(CrO4)(H20)5, the chromate analog of schieffelinite. American Mineralogist, 97 (1): 212 - 219. doi: 10.2138/am.2011.3909

SMITH M, SPRATT J (2012) The Chemistry of Niobium Mineralisation at Bayan Obo, Inner Mongolia, China: Constraints on the Hydrothermal Precipitation and Alteration of Nb-Minerals. Acta Geologica Sinica, 86 : 700 - 722.

ZAITSEV AN, Chakhmouradian AR, Siidra OI, SPRATT J, WILLIAMS CT, STANLEY CJ, Petrov SV, Britvin SN, Polyakova EA (2011) Fluorine-, yttrium- and lanthanide-rich cerianite-(Ce) from carbonatitic rocks of the Kerimasi volcano and surrounding explosion craters, Gregory Rift, northern Tanzania. Mineralogical Magazine, 75 (6): 2813 - 2822. doi: 10.1180/minmag.2011.075.6.2813

ZAITSEV AN, Wenzel T, SPRATT J, WILLIAMS TC, STREKOPYTOV S, Sharygin VV, Petrov SV, Golovina TA, Zaitseva EO, Markl G (2011) Was Sadiman volcano a source for the Laetoli Footprint Tuff?. Journal of Human Evolution, 61 (1): 121 - 124. doi: 10.1016/j.jhevol.2011.02.004

PURVIS OW, Bennett JP, SPRATT J (2011) 169Copper localization, elemental content, and thallus colour in the copper hyperaccumulator lichen Lecanora sierrae from California. The Lichenologist, 43 (2): 165 - 173. doi: 10.1017/s0024282910000770

Mills S, RUMSEY M, Favreau G, SPRATT J, Raudsepp M, Dini M (2011) Bariopharmacoalumite, a new mineral species from Cap Garonne, France and Mina Grande, Chile. Mineralogical Magazine, 75 (1): 135 - 144. doi: 10.1180/minmag.2011.075.1.135

Kuznetsova LG, Zolotarev AA, Frank-Kamenetskaya OV, Rozhdestvenskaya IV, Bronzova YM, SPRATT J, Ertl A (2011) Chemical composition and species attribution of tourmalines from a rare-metal pegmatite vein with scapolite, Sangilen Upland, Tuva. Geology of Ore Deposits, 53 (8): 806 - 817. doi: 10.1134/s1075701511080095

RUMSEY MS, Mills SJ, SPRATT J (2010) Natropharmacoalumite, NaAl4[(OH)4(AsO4)3].4H2O, a new mineral of the pharmacosiderite supergroup and the renaming of aluminopharmacosiderite to pharmacoalumite. Mineralogical Magazine, 74 (5): 929 - 936. doi: 10.1180/minmag.2010.074.5.929

ZAITSEV AN, WILLIAMS CT, Britvin SN, Kuznetsova IV, SPRATT J, Petrov SV, Keller J (2010) Kerimasite, Ca3Zr2(Fe2Si)O12, a new garnet from carbonatites of Kerimasi volcano and surrounding explosion craters, northern Tanzania. Mineralogical Magazine, 74 (5): 803 - 820. doi: 10.1180/minmag.2010.074.5.803

Zaitsev AN, Keller J, Spratt J, Jeffries TE, Sharygin VV (2009) Chemical Composition of Nyerereite and Gregoryite from Natrocarbonatites of Oldoinyo Lengai Volcano, Tanzania. Geology of Ore Deposits, 51 (7): 608 - 616. doi: 10.1134/s1075701509070095

Yusupov RG, STANLEY CJ, WELCH MD, SPRATT J, CRESSEY G, RUMSEY MS, SELTMANN R, Igamberdiev E (2009) Mavlyanovite, Mn5Si3, a new mineral species from a lamproite diatreme, Chatkal Ridge, Uzbekistan. Mineralogical Magazine, 73 (1): 43 - 50. doi: 10.1180/minmag.2009.073.1.43

Müller A, Ihlen PM, Larsen RB, SPRATT J, SELTMANN R (2009) Quartz and garnet chemistry of South Norwegian pegmatites and its implications for pegmatite genesis. Estudos Geolόgicos, 19 : 20 - 24.

ZAITSEV AN, Keller J, SPRATT J, Perova EN, KEARSLEY A (2008) Nyererite - Pirssonite - Calcite - Shortite relationships in altered natrocarbonatites, Oldoinyo Lengai, Tanzania. Canadian Mineralogist, 46 (4): 843 - 860. doi: 10.3749/canmin.46.4.843

PURVIS W, Pawlik-Skowronska B, CRESSEY G, JONES GC, KEARSLEY A, SPRATT J (2008) Mineral phases and element composition of the copper hyperaccumulator lichen Lecanora polytropa. Mineralogical Magazine, 72 (2): 607 - 616. doi: 10.1180/minmag.2008.072.2.607

Chapman R, Mercer IF, Rankin AH, SPRATT J (2008) Thortveitite - a new gemstone. Journal of Gemmology, 31 : 1 - 6.

Yusupov RG, STANLEY CJ, WELCH MD, SPRATT J, CRESSEY G, RUMSEY MS, SELTMANN R, Igamberdiev E (2008) Mavlyanovite, Mn5Si3, a new mineral. Geology and Mineral Resources,

ZAITSEV AN, Keller J, SPRATT J, JEFFRIES TE, Sharygin VV (2008) Chemical composition of Nyerereite and gregoryite from natrocarbonatites of Oldoinyo Lengai volcano Tanzania. Zapiski (Proceedings) of the Russian Mineralogical Society, 137 : 101 - 111.

RUMSEY MS, Bridges TF, SPRATT J (2007) The first British occurrence of petitjeanite at Carrock Mine, Caldbeck Fells, Cumbria. UK Journal of Mines and Minerals, 28 : 47 - 50.

KEARSLEY AT, Graham GA, Burchell MJ, Cole MJ, Dai ZR, Teslich N, Bradley JP, Chater R, WOZNIAKIEWICZ PJ, SPRATT J, JONES G (2007) Analytical scanning and transmission electron microscopy of laboratory impacts on Stardust aluminum foils: interpreting impact crater morphology and the composition of impact residues. Meteoritics and Planetary Science, 42 (2): 191 - 210. doi: 10.1111/j.1945-5100.2007.tb00227.x

Muller A, Seltmann R, Halls C, Siebel W, Dulski P, Jeffries T, Spratt J, Kronz A (2006) The magmatic evolution of the Land's End pluton, Cornwall, and associated pre-enrichment of metals. Ore Geology Reviews, 28 (3): 329 - 367. doi: 10.1016/j.oregeorev.2005.05.002

Mason TFD, Weiss DJ, Chapman JB, Wilkinson JJ, Tessalina SG, Spiro B, Horstwood MSA, Spratt J, Coles BJ (2005) Zn and Cu isotopic variability in the Alexandrinka volcanic-hosted massive sulphide (VHMS) ore deposit, Urals, Russia. CHEMICAL GEOLOGY, 221 : 170 - 187. doi: 10.1016/j.chemgeo.2005.04.011

Stanley CJ, Criddle AJ, Spratt J, Roberts AC, Szymanski JT, Welch MD (2005) Kingstonite, (Rh,Ir,Pt)(3)S-4, a new mineral species from Yubdo, Ethiopia. MINERALOGICAL MAGAZINE, 69 (4): 447 - 453. doi: 10.1180/0026461056940262

STANLEY CJ, CRIDDLE AJ, Roberts AC, Szymanski J, SPRATT J, WELCH MD (2005) Kingstonite, (Rh,Ir,Pt)3S4 a new rhodium sulphide from Yubdo, Ethiopia. Mineralogical Magazine, 65 : 449 - 455.

Roberts AC, Stirling JAR, CRIDDLE AJ, Dunning GE, SPRATT J (2004) Aurivilliusite, Hg2+Hg1+OI, a new mineral species from the Clear Creek claim, San Benito County, California, USA. Mineralogical Magazine, 68 (2): 241 - 245. doi: 10.1180/0026461046820184

WILLIAMSON BJ (2000) Geochemical Constraints from Zoned Hydrothermal Tourmalines on Fluid Evolution and Sn Mineralization: an Example from Fault Breccias at Roche, SW England. Journal of Petrology, 41 (9): 1439 - 1453. doi: 10.1093/petrology/41.9.1439

Large DJ (1999) A Cobaltite-Framboidal Pyrite Association from the Kupferschiefer: Possible Implications for Trace Element Behaviour During the Earliest Stages of Diagenesis. Mineralogical Magazine, 63 (3): 353 - 361. doi: 10.1180/002646199548574

Betterton J, Jewson C, Green DI, Spratt J, Tandy P (1998) The composition and structure of jeanbandyite and natanite. Mineralogical Magazine, 62 (5): 707 - 712. doi: 10.1180/002646198547945


Southgate VR, Rollinson D, De Bont J, Vercruysse J, Van Aken D, Spratt J (1990) Surface topography of the tegument of adult Schistosoma nasale Rao, 1933 from Sri Lanka. Systematic Parasitology, 16 (2): 139 - 147. doi: 10.1007/BF00009612