Dr Jens Najorka

Dr Jens Najorka

X Ray Lab Manager

Department: Core Research Laboratories
Division: Imaging and Analysis Centre

Qualifications

Degrees

PhD Mineralogy (Experimental Petrology), Technical University of Berlin, GFZ German Research Centre for Geosciences, Potsdam, Germany, 1996 - 2000

Diploma Mineralogy, Technical University of Berlin, Freiberg Mining Academy, Germany

Employment history

Academic

X-ray Laboratory Manager, Natural History Museum, United Kingdom, 2008 - ongoing

Postdoctoral Fellow, Department of Earth Sciences, University of Bristol, United Kingdom, 2001 - 2001

Non-academic

Researcher Mineralogy, Tata Steel RD&T, Ceramics Research Centre, IJmuiden, Netherlands, Microstructure, Crystallography and Thermal Analysis Group, 2001 - 2008

Publications

Veillard CMA, John CM, Krevor S, Najorka J (2019) Rock-buffered recrystallization of Marion Plateau dolomites at low temperature evidenced by clumped isotope thermometry and X-ray diffraction analysis. Geochimica et Cosmochimica Acta, 252 : 190 - 212. doi: 10.1016/j.gca.2019.02.012

Suttle MD, Folco L, Genge MJ, Russell SS, Najorka J, van Ginneken M (2019) Intense aqueous alteration on C-type asteroids: Perspectives from giant fine-grained micrometeorites. GEOCHIMICA ET COSMOCHIMICA ACTA, 245 : 352 - 373. doi: 10.1016/j.gca.2018.11.019

Burgioa L, Melchar D, Strekopytov S, Peggie DA, Di Crescenzo MM, Keneghan B, Najorka J, Goral T, Garbout A, Clark BL (2018) Identification, characterisation and mapping of calomel as 'mercury white', a previously undocumented pigment from South America, and its use on a barniz de Pasto cabinet at the Victoria and Albert Museum. MICROCHEMICAL JOURNAL, 143 : 220 - 227. doi: 10.1016/j.microc.2018.08.010

D'Arcy M, Mason PJ, Roda-Boluda DC, Whittaker AC, Lewis JM, Najorka J (2018) Alluvial fan surface ages recorded by Landsat-8 imagery in Owens Valley, California. Remote Sensing of Environment, 216 : 401 - 414. doi: 10.1016/j.rse.2018.07.013

Loxton J, Spencer Jones M, Najorka J, Smith AM, Porter JS (2018) Skeletal carbonate mineralogy of Scottish bryozoans. PLOS ONE, 13 (6) : e0197533 - e0197533. doi: 10.1371/journal.pone.0197533

Pinzari F, Cuadros J, Migliore M, Napoli R, Najorka J (2018) Manganese translocation and concentration on Quercus cerris decomposing leaf and wood litter by an ascomycetous fungus: an active process with ecosystem consequences?. FEMS Microbiology Ecology, 94 (8) : doi: 10.1093/femsec/fiy111

Putzolu F, Balassone G, Boni M, Maczurad M, Mondillo N, Najorka J, Pirajno F (2018) Mineralogical association and Ni-Co deportment in the Wingellina oxide-type laterite deposit (Western Australia). Ore Geology Reviews, 97 : 21 - 34. doi: 10.1016/j.oregeorev.2018.05.005

Lewis JM, Najorka J, Watson JS, Sephton MA (2018) The Search for Hesperian Organic Matter on Mars: Pyrolysis Studies of Sediments Rich in Sulfur and Iron. Astrobiology, 18 (4) : 454 - 464. doi: 10.1089/ast.2017.1717

Loxton J, Najorka J, Humphreys-Williams E, Kuklinski P, Smith AM, Porter JS, Spencer Jones M (2017) The forgotten variable: Impact of cleaning on the skeletal composition of a marine invertebrate. Chemical Geology, 474 : 45 - 57. doi: 10.1016/j.chemgeo.2017.10.022

Laycock A, Romero-Freire A, Najorka J, Svendsen C, van Gestel CAM, Rehkämper M (2017) Novel Multi-isotope Tracer Approach To Test ZnO Nanoparticle and Soluble Zn Bioavailability in Joint Soil Exposures. Environmental Science & Technology, 51 (21) : 12756 - 12763. doi: 10.1021/acs.est.7b02944

Iglikowska A, Najorka J, Voronkov A, Chełchowski M, Kukliński P (2017) Variability in magnesium content in Arctic echinoderm skeletons. Marine Environmental Research, 129 : 207 - 218. doi: 10.1016/j.marenvres.2017.06.002

Piwoni-Piórewicz A, Kukliński P, Strekopytov S, Humphreys-Williams E, Najorka J, Iglikowska A (2017) Size effect on the mineralogy and chemistry of Mytilus trossulus shells from the southern Baltic Sea: implications for environmental monitoring. Environmental Monitoring and Assessment, 189 (4) : doi: 10.1007/s10661-017-5901-y

Wrona T, Taylor KG, Jackson CA-L, Huuse M, Najorka J, Pan I (2017) Impact of silica diagenesis on the porosity of fine-grained strata: An analysis of Cenozoic mudstones from the North Sea. Geochemistry, Geophysics, Geosystems, 18 (4) : 1537 - 1549. doi: 10.1002/2016GC006482

Wadsworth FB, Heap MJ, Damby DE, Hess K-U, Najorka J, Vasseur J, Fahrner D, Dingwell DB (2017) Local geology controlled the feasibility of vitrifying Iron Age buildings. Scientific Reports, 7 (1) : doi: 10.1038/srep40028

Mitchell RL, Cuadros J, Duckett JG, Pressel S, Mavris C, Sykes D, Najorka J, Edgecombe GD, Kenrick P (2016) Mineral weathering and soil development in the earliest land plant ecosystems. Geology, 44 (12) : 1007 - 1010. doi: 10.1130/G38449.1

Mitchell RL, Cuadros J, Pressel S, Duckett JG, Mavris C, Sykes D, Najorka J, Edgecombe GD, Kenrick P (2016) Leaving their mark: biologically-induced mineral weathering and soil development in ancient land-plant ecosystems. Geological Society of America, Annual Meeting 2016, 259 9 - 25 9 9Abstracts and Proceedings 48 : doi: 10.1130/abs/2016AM-282635

Krzeminska M, Kuklinski P, Najorka J, Iglikowska A (2016) Skeletal Mineralogy Patterns of Antarctic Bryozoa. The Journal of Geology, 124 (3) : 411 - 422. doi: 10.1086/685507

Najorka J, Lewis JMT, Spratt J, Sephton MA (2016) Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite. Physics and Chemistry of Minerals, 43 (5) : 377 - 386. doi: 10.1007/s00269-016-0802-0

Wadsworth FB, Damby DE, Hearne RL, Le Blond JS, Vasseur J, Najorka J, Hess K-U, Dingwell DB (2015) The feasibility of vitrifying a sandstone enclosure in the British Iron Age. Journal of Archaeological Science: Reports, 4 : 605 - 612. doi: 10.1016/j.jasrep.2015.06.007

Rumsey MS, Dossett I, Green DI, Najorka J, Spratt J (2015) Crookesite, Cu7TlSe4, from Littleham Cove, Devon: the first mineral containing essential thallium from the British Isles.. Journal of the Russell Society, 18 : 48 - 52.

Vaccaro E, King AJ, Najorka J, Starkey NA, Franchi IA, Russell SS (2015) IN-SITU MICRO-XRD COMPARATIVE STUDY OF MIL 07687 AND ALHA77307 MATRIX.. METEORITICS & PLANETARY SCIENCE 50 :

Green G, Higginson R, Hogg S, Spindler S, Hamm C, Najorka J (2015) Analysis of ferrite formed in 321 grade austenitic stainless steel. Materials Science and Technology, 31 (4) : 418 - 425. doi: 10.1179/1743284714Y.0000000564

Lewis JM, Watson JS, Najorka J, Luong D, Sephton MA (2015) Sulfate Minerals: A Problem for the Detection of Organic Compounds on Mars?. Astrobiology, 15 (3) : 247 - 258. doi: 10.1089/ast.2014.1160

Williamson C, Najorka J, Perkins R, Yallop M, Brodie J (2014) Skeletal mineralogy of geniculate corallines: providing context for climate change and ocean acidification research. Marine Ecology Progress Series, 513 : 71 - 84. doi: 10.3354/meps10929

Loxton J, Kuklinski P, Najorka J, Spencer Jones M, Porter J (2014) Variability in the skeletal mineralogy of temperate bryozoans: the relative influence of environmental and biological factors. Marine Ecology Progress Series, 510 : 45 - 57. doi: 10.3354/meps10889

Damby DE, Llewellin EW, Horwell CJ, Williamson BJ, Najorka J, Cressey G, Carpenter M (2014) The α–β phase transition in volcanic cristobalite. Journal of Applied Crystallography, 47 (4) : 1205 - 1215. doi: 10.1107/S160057671401070X

Loxton J, Kuklinski P, Barnes D, Najorka J, Spencer Jones M, Porter J (2014) Variability of Mg-calcite in Antarctic bryozoan skeletons across spatial scales. Marine Ecology Progress Series, 507 : 169 - 180. doi: 10.3354/meps10826

Velis CA, Franco-Salinas C, O’Sullivan C, Najorka J, Boccaccini AR, Cheeseman CR (2014) Up-Cycling Waste Glass to Minimal Water Adsorption/Absorption Lightweight Aggregate by Rapid Low Temperature Sintering: Optimization by Dual Process-Mixture Response Surface Methodology. Environmental Science & Technology, 48 (13) : 7527 - 7535. doi: 10.1021/es5003499

Purvis O, Convey P, Flowerdew M, Peat H, Najorka J, Kearsley A (2013) Iron localization in Acarospora colonizing schist on Signy Island. Antarctic Science, 25 (01) : 24 - 30. doi: 10.1017/S0954102012000582

Ferrat M, Weiss DJ, Strekopytov S, Dong S, Chen H, Najorka J, Sun Y, Gupta S, Tada R, Sinha R (2011) Improved provenance tracing of Asian dust sources using rare earth elements and selected trace elements for palaeomonsoon studies on the eastern Tibetan Plateau. Geochimica et Cosmochimica Acta, 75 (21) : 6374 - 6399. doi: 10.1016/j.gca.2011.08.025

Humphreys ER, Bailey K, Hawkesworth CJ, Wall F, Najorka J, Rankin AH (2010) Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth. Geology, 38 (10) : 911 - 914. doi: 10.1130/G31199.1

Andrut M, E. Harlov D, Najorka J (2004) Characterization of ammonioleucite (NH4)[AlSi2O6] and ND4-ammonioleucite (ND4)[AlSi2O6] using IR spectroscopy and Rietveld refinement of XRD spectra. Mineralogical Magazine, 68 (01) : 177 - 189. doi: 10.1180/0026461046810179

Najorka J, Gottschalk M (2003) Crystal chemistry of tremolite-tschermakite solid solutions. Physics and Chemistry of Minerals, 30 (2) : 108 - 124. doi: 10.1007/s00269-002-0291-1

McDade P, Wood BJ, Van Westrenen W, Brooker R, Gudmundsson G, Soulard H, Najorka J, Blundy J (2002) Pressure corrections for a selection of piston-cylinder cell assemblies. Mineralogical Magazine, 66 (06) : 1021 - 1028. doi: 10.1180/0026461026660074

Najorka J, Gottschalk M, Heinrich W (2002) Composition of synthetic tremolite-tschermakite solid solutions in amphibole + anothite- and amphibole + zoisite-bearing assemblages. American Mineralogist: an international journal of earth and planetary materials, 87 : 462 - 477.

Andrut M, Gottschalk M, Melzer S, Najorka J (2000) Lattice vibrational modes in synthetic tremolite-Sr-tremolite and tremolite-richterite solid solutions. Physics and Chemistry of Minerals, 27 (5) : 301 - 309. doi: 10.1007/s002690050259

Najorka J, Gottschalk M, Franz G, Heinrich W (1999) Ca-Sr distribution among amphibole, clinopyroxene and chloride-bearing solution. American Mineralogist: an international journal of earth and planetary materials, 84 : 596 - 606.

Gottschalk M, Najorka J, Andrut M (1998) Structural and compositional characterization of synthetic (Ca,Sr)-tremolite and (Ca,Sr)-diopside solid solutions. Physics and Chemistry of Minerals, 25 (6) : 415 - 428. doi: 10.1007/s002690050131

Introduction

Qualifications

Degrees

PhD Mineralogy (Experimental Petrology), Technical University of Berlin, GFZ German Research Centre for Geosciences, Potsdam, Germany, 1996 - 2000

Diploma Mineralogy, Technical University of Berlin, Freiberg Mining Academy, Germany

Employment history

Academic

X-ray Laboratory Manager, Natural History Museum, United Kingdom, 2008 - ongoing

Postdoctoral Fellow, Department of Earth Sciences, University of Bristol, United Kingdom, 2001 - 2001

Non-academic

Researcher Mineralogy, Tata Steel RD&T, Ceramics Research Centre, IJmuiden, Netherlands, Microstructure, Crystallography and Thermal Analysis Group, 2001 - 2008

Publications

Publications

Veillard CMA, John CM, Krevor S, Najorka J (2019) Rock-buffered recrystallization of Marion Plateau dolomites at low temperature evidenced by clumped isotope thermometry and X-ray diffraction analysis. Geochimica et Cosmochimica Acta, 252 : 190 - 212. doi: 10.1016/j.gca.2019.02.012

Suttle MD, Folco L, Genge MJ, Russell SS, Najorka J, van Ginneken M (2019) Intense aqueous alteration on C-type asteroids: Perspectives from giant fine-grained micrometeorites. GEOCHIMICA ET COSMOCHIMICA ACTA, 245 : 352 - 373. doi: 10.1016/j.gca.2018.11.019

Burgioa L, Melchar D, Strekopytov S, Peggie DA, Di Crescenzo MM, Keneghan B, Najorka J, Goral T, Garbout A, Clark BL (2018) Identification, characterisation and mapping of calomel as 'mercury white', a previously undocumented pigment from South America, and its use on a barniz de Pasto cabinet at the Victoria and Albert Museum. MICROCHEMICAL JOURNAL, 143 : 220 - 227. doi: 10.1016/j.microc.2018.08.010

D'Arcy M, Mason PJ, Roda-Boluda DC, Whittaker AC, Lewis JM, Najorka J (2018) Alluvial fan surface ages recorded by Landsat-8 imagery in Owens Valley, California. Remote Sensing of Environment, 216 : 401 - 414. doi: 10.1016/j.rse.2018.07.013

Loxton J, Spencer Jones M, Najorka J, Smith AM, Porter JS (2018) Skeletal carbonate mineralogy of Scottish bryozoans. PLOS ONE, 13 (6) : e0197533 - e0197533. doi: 10.1371/journal.pone.0197533

Pinzari F, Cuadros J, Migliore M, Napoli R, Najorka J (2018) Manganese translocation and concentration on Quercus cerris decomposing leaf and wood litter by an ascomycetous fungus: an active process with ecosystem consequences?. FEMS Microbiology Ecology, 94 (8) : doi: 10.1093/femsec/fiy111

Putzolu F, Balassone G, Boni M, Maczurad M, Mondillo N, Najorka J, Pirajno F (2018) Mineralogical association and Ni-Co deportment in the Wingellina oxide-type laterite deposit (Western Australia). Ore Geology Reviews, 97 : 21 - 34. doi: 10.1016/j.oregeorev.2018.05.005

Lewis JM, Najorka J, Watson JS, Sephton MA (2018) The Search for Hesperian Organic Matter on Mars: Pyrolysis Studies of Sediments Rich in Sulfur and Iron. Astrobiology, 18 (4) : 454 - 464. doi: 10.1089/ast.2017.1717

Loxton J, Najorka J, Humphreys-Williams E, Kuklinski P, Smith AM, Porter JS, Spencer Jones M (2017) The forgotten variable: Impact of cleaning on the skeletal composition of a marine invertebrate. Chemical Geology, 474 : 45 - 57. doi: 10.1016/j.chemgeo.2017.10.022

Laycock A, Romero-Freire A, Najorka J, Svendsen C, van Gestel CAM, Rehkämper M (2017) Novel Multi-isotope Tracer Approach To Test ZnO Nanoparticle and Soluble Zn Bioavailability in Joint Soil Exposures. Environmental Science & Technology, 51 (21) : 12756 - 12763. doi: 10.1021/acs.est.7b02944

Iglikowska A, Najorka J, Voronkov A, Chełchowski M, Kukliński P (2017) Variability in magnesium content in Arctic echinoderm skeletons. Marine Environmental Research, 129 : 207 - 218. doi: 10.1016/j.marenvres.2017.06.002

Piwoni-Piórewicz A, Kukliński P, Strekopytov S, Humphreys-Williams E, Najorka J, Iglikowska A (2017) Size effect on the mineralogy and chemistry of Mytilus trossulus shells from the southern Baltic Sea: implications for environmental monitoring. Environmental Monitoring and Assessment, 189 (4) : doi: 10.1007/s10661-017-5901-y

Wrona T, Taylor KG, Jackson CA-L, Huuse M, Najorka J, Pan I (2017) Impact of silica diagenesis on the porosity of fine-grained strata: An analysis of Cenozoic mudstones from the North Sea. Geochemistry, Geophysics, Geosystems, 18 (4) : 1537 - 1549. doi: 10.1002/2016GC006482

Wadsworth FB, Heap MJ, Damby DE, Hess K-U, Najorka J, Vasseur J, Fahrner D, Dingwell DB (2017) Local geology controlled the feasibility of vitrifying Iron Age buildings. Scientific Reports, 7 (1) : doi: 10.1038/srep40028

Mitchell RL, Cuadros J, Duckett JG, Pressel S, Mavris C, Sykes D, Najorka J, Edgecombe GD, Kenrick P (2016) Mineral weathering and soil development in the earliest land plant ecosystems. Geology, 44 (12) : 1007 - 1010. doi: 10.1130/G38449.1

Mitchell RL, Cuadros J, Pressel S, Duckett JG, Mavris C, Sykes D, Najorka J, Edgecombe GD, Kenrick P (2016) Leaving their mark: biologically-induced mineral weathering and soil development in ancient land-plant ecosystems. Geological Society of America, Annual Meeting 2016, 259 9 - 25 9 9Abstracts and Proceedings 48 : doi: 10.1130/abs/2016AM-282635

Krzeminska M, Kuklinski P, Najorka J, Iglikowska A (2016) Skeletal Mineralogy Patterns of Antarctic Bryozoa. The Journal of Geology, 124 (3) : 411 - 422. doi: 10.1086/685507

Najorka J, Lewis JMT, Spratt J, Sephton MA (2016) Single-crystal X-ray diffraction study of synthetic sodium–hydronium jarosite. Physics and Chemistry of Minerals, 43 (5) : 377 - 386. doi: 10.1007/s00269-016-0802-0

Wadsworth FB, Damby DE, Hearne RL, Le Blond JS, Vasseur J, Najorka J, Hess K-U, Dingwell DB (2015) The feasibility of vitrifying a sandstone enclosure in the British Iron Age. Journal of Archaeological Science: Reports, 4 : 605 - 612. doi: 10.1016/j.jasrep.2015.06.007

Rumsey MS, Dossett I, Green DI, Najorka J, Spratt J (2015) Crookesite, Cu7TlSe4, from Littleham Cove, Devon: the first mineral containing essential thallium from the British Isles.. Journal of the Russell Society, 18 : 48 - 52.

Vaccaro E, King AJ, Najorka J, Starkey NA, Franchi IA, Russell SS (2015) IN-SITU MICRO-XRD COMPARATIVE STUDY OF MIL 07687 AND ALHA77307 MATRIX.. METEORITICS & PLANETARY SCIENCE 50 :

Green G, Higginson R, Hogg S, Spindler S, Hamm C, Najorka J (2015) Analysis of ferrite formed in 321 grade austenitic stainless steel. Materials Science and Technology, 31 (4) : 418 - 425. doi: 10.1179/1743284714Y.0000000564

Lewis JM, Watson JS, Najorka J, Luong D, Sephton MA (2015) Sulfate Minerals: A Problem for the Detection of Organic Compounds on Mars?. Astrobiology, 15 (3) : 247 - 258. doi: 10.1089/ast.2014.1160

Williamson C, Najorka J, Perkins R, Yallop M, Brodie J (2014) Skeletal mineralogy of geniculate corallines: providing context for climate change and ocean acidification research. Marine Ecology Progress Series, 513 : 71 - 84. doi: 10.3354/meps10929

Loxton J, Kuklinski P, Najorka J, Spencer Jones M, Porter J (2014) Variability in the skeletal mineralogy of temperate bryozoans: the relative influence of environmental and biological factors. Marine Ecology Progress Series, 510 : 45 - 57. doi: 10.3354/meps10889

Damby DE, Llewellin EW, Horwell CJ, Williamson BJ, Najorka J, Cressey G, Carpenter M (2014) The α–β phase transition in volcanic cristobalite. Journal of Applied Crystallography, 47 (4) : 1205 - 1215. doi: 10.1107/S160057671401070X

Loxton J, Kuklinski P, Barnes D, Najorka J, Spencer Jones M, Porter J (2014) Variability of Mg-calcite in Antarctic bryozoan skeletons across spatial scales. Marine Ecology Progress Series, 507 : 169 - 180. doi: 10.3354/meps10826

Velis CA, Franco-Salinas C, O’Sullivan C, Najorka J, Boccaccini AR, Cheeseman CR (2014) Up-Cycling Waste Glass to Minimal Water Adsorption/Absorption Lightweight Aggregate by Rapid Low Temperature Sintering: Optimization by Dual Process-Mixture Response Surface Methodology. Environmental Science & Technology, 48 (13) : 7527 - 7535. doi: 10.1021/es5003499

Purvis O, Convey P, Flowerdew M, Peat H, Najorka J, Kearsley A (2013) Iron localization in Acarospora colonizing schist on Signy Island. Antarctic Science, 25 (01) : 24 - 30. doi: 10.1017/S0954102012000582

Ferrat M, Weiss DJ, Strekopytov S, Dong S, Chen H, Najorka J, Sun Y, Gupta S, Tada R, Sinha R (2011) Improved provenance tracing of Asian dust sources using rare earth elements and selected trace elements for palaeomonsoon studies on the eastern Tibetan Plateau. Geochimica et Cosmochimica Acta, 75 (21) : 6374 - 6399. doi: 10.1016/j.gca.2011.08.025

Humphreys ER, Bailey K, Hawkesworth CJ, Wall F, Najorka J, Rankin AH (2010) Aragonite in olivine from Calatrava, Spain—Evidence for mantle carbonatite melts from >100 km depth. Geology, 38 (10) : 911 - 914. doi: 10.1130/G31199.1

Andrut M, E. Harlov D, Najorka J (2004) Characterization of ammonioleucite (NH4)[AlSi2O6] and ND4-ammonioleucite (ND4)[AlSi2O6] using IR spectroscopy and Rietveld refinement of XRD spectra. Mineralogical Magazine, 68 (01) : 177 - 189. doi: 10.1180/0026461046810179

Najorka J, Gottschalk M (2003) Crystal chemistry of tremolite-tschermakite solid solutions. Physics and Chemistry of Minerals, 30 (2) : 108 - 124. doi: 10.1007/s00269-002-0291-1

McDade P, Wood BJ, Van Westrenen W, Brooker R, Gudmundsson G, Soulard H, Najorka J, Blundy J (2002) Pressure corrections for a selection of piston-cylinder cell assemblies. Mineralogical Magazine, 66 (06) : 1021 - 1028. doi: 10.1180/0026461026660074

Najorka J, Gottschalk M, Heinrich W (2002) Composition of synthetic tremolite-tschermakite solid solutions in amphibole + anothite- and amphibole + zoisite-bearing assemblages. American Mineralogist: an international journal of earth and planetary materials, 87 : 462 - 477.

Andrut M, Gottschalk M, Melzer S, Najorka J (2000) Lattice vibrational modes in synthetic tremolite-Sr-tremolite and tremolite-richterite solid solutions. Physics and Chemistry of Minerals, 27 (5) : 301 - 309. doi: 10.1007/s002690050259

Najorka J, Gottschalk M, Franz G, Heinrich W (1999) Ca-Sr distribution among amphibole, clinopyroxene and chloride-bearing solution. American Mineralogist: an international journal of earth and planetary materials, 84 : 596 - 606.

Gottschalk M, Najorka J, Andrut M (1998) Structural and compositional characterization of synthetic (Ca,Sr)-tremolite and (Ca,Sr)-diopside solid solutions. Physics and Chemistry of Minerals, 25 (6) : 415 - 428. doi: 10.1007/s002690050131