b'Pyritethe firestoneFeatureprovided helpful comments especially on physics and pyriteIndraratna, B., B. Blunden, and G. Nethery. 1999. Nature ignition. Dr Phil Schmidt (CSIRO emeritus) kindly read theand properties of acid sulphate soils in drained coastal draft manuscript, as did Paul Munro. Thanks to all. Furtherlowlands in New South Wales. Australian Geomechanics 34: information on diodic materials may be found in an article by6178.Ian Poole http://www.electronics-notes.com/articles/history/ Jones, B. 1933. Pyrite the stone that strikes fire. Rock & Gem. radio-receivers/cats-whisker-crystal-types.php 46/11: 1015.Irdi, G. A., and H. B. Booher. 1994. Light microscopical Title image attributions: evaluation of pyrite oxidation of heap leached samples from a Pittsburgh seam coal. Journal of Microscopy 176: Left of main title: http://www.mindat.org/photo-118006.html,34-44.CC-BY-SA-3.0 Lindgren, W. 1933. Mineral deposits. McGraw-Hill Book Company Inc.Right of main title: Pyrite cubic crystals on marlstone, fromMcNally, G. H. 1998. Soil and rock construction materials. E & FN Navajn, Rioja, Spain, https://commons.wikimedia.org/wiki/ Spon.File:2780M-pyrite1.jpg, Creative Commons Attribution-ShareOlhoeft, G. R., et al. 1981. Electrical properties of rocks. In Alike 3.0 Unported license (image cropped) Physical properties of rocks and minerals, Vol. 11-12, ed. Y.S. Attribution of image after references: Macle de trois cristaux deTouloukian, 9, 259320. McGraw Hill.pyrite, https://commons.wikimedia.org/wiki/File:Pyrite_60608. Parasnis, D. S. 1956. The electrical resistivity of some sulphide jpg, public domain and oxide minerals and their ores. Geophysical Prospecting 4: 249278.Parkhomenko, E. I. 1967. Electrical properties of rocks. Plenum References Press.Beamish, B. 2017. Implications of pyritic coal dust for coalRay, H. N. 1988. Dimension stone in New South Wales, Report GS workers pneunconiosis. AusIMM Bulletin Magazine August1988/102. Geological Survey of New South Wales.issue: 6870. Australasian Institute of Mining and Metallurgy,Shuey, R. T. 1975. Semiconducting ore minerals. Elsevier.Melbourne. Smith, M. R. 1999. StoneBuilding stone, rock fill and Beckmann, J. 1799. Marbodi liber lapidum seu de gemmisarmourstone in construction. Engineering Geology Special (Marbods book of stones and on gems). Gottingen: J.C.Publications 16, Geological Society, London.Dieterich. Taylor, S. 2019. What is panspiritism? Philosophy Now 131: 3337.Blanchard, R. 1968. Interpretation of leached outcrops. BulletinTelkes, M. 1950. Thermoelectric power and electrical resistivity 66, University of Nevada. of minerals. American Mineralogist 35: 536555.Cave-Brown, P. 1992. The use of iron pyrites for the creation ofVoynick, S. 2011. Pyrite from cubes to suns. Rock & Gem 41/8:30.fire. Lithics 13: 5260. Lithic Studies Society Newsletter. Voynick, S. 2018a. Pyrite iron and flint the fire makers. Rock & Clark, D. A. 1997. Magnetic petrophysics and magneticGem 48/6:5455.petrology: aids to geological interpretation of magneticVoynick, S. 2018b. Pyrite a natural history. Rock & Gem surveys. AGSO Journal of Australian Geology & Geophysics 17:48/9:4856.83103. Ward, S. H. 1966. The search for massive sulphides, Clarke, S. P. 1966. Handbook of physical constants. Memoir 97introduction. Mining Geophysics 1: 117129. Soc. Explor. The Geological Society of America. Geophys. Tulsa.Cox, D. P., and D. A. Singer. 1986. Mineral deposit models. U.S.Wrangham, R. 2009. Catching fire, how cooking made us human. Geol. Surv. Bulletin 1693. London: Profile Books.David, J. 2016. The private lives of rocks. Philosophy Now 117: 14. Yang, Y. P., and D. W. Emerson. 1997. Electromagnetic Deer, W. A., R. A. Howie, and J. Zussman. 1992. An introduction toconductivities of rock cores, theory and analog results. rock forming minerals. Longman Scientific & Technical. Geophysics 62: 17791793. doi:10.1190/1.1444278.Emerson, D. W. 1990. Notes on mass properties of rocksdensity, porosity, permeability. Exploration Geophysics 21: 209216. doi:10.1071/EG990209.Eicholz, D. E. 1971. Pliny natural history, books 36 and 37. Harvard University Press. [Loeb Classical Library #419].Evans, J. 1897. Ancient stone implements, weapons and ornaments of Great Britain. London: Longmans.Gottschalk, V. H., and H. A. Buehler. 1910. Oxidation of sulphides. Econ. Geol 5: 16.Harvey, R. D. 1928. Electrical conductivity and polished mineral surfaces. Economic Geology and the Bulletin of the Society of Economic Geologists 23: 778803. doi:10.2113/gsecongeo.23.7.778.Heiland, C. A. 1940. Geophysical Exploration. Prentice Hall.Hoover, H. C., and L. H. Hoover. 1950. De re metallica. Dover Puvls. [Agricola on mining]. Don Emerson is a geophysical consultant specialising in Hill, A. P., and R. Green. 1962. Thermoelectricity and resistivitythe physics of minerals and rocks, he also has an interest in of pyrite from Renison Bell and Mt Bischoff, Tasmania. Econ.ancient and medieval geoscience. Geol. 57: 579586.DECEMBER 2019 PREVIEW 64'