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Physico-chemical study of an exogenic fulgurite from a thunderstorm on 10th August 2013 in Dallas, TX

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Abstract

Droplet-like exogenic fulgurites comprise a minor grouplet of natural glasses resulting from powerful lightning strikes. Reports on such type-V fulgurites are scarce in the literature. In this work, a fulgurite specimen from the thunderstorm that took place on 10th August 2013, in Dallas, TX, USA, has been analyzed using X-ray powder diffraction, X-ray fluorescence, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and infrared and Raman spectroscopy techniques. X-ray diffraction revealed the amorphous nature of the exofulgurite, and X-ray fluorescence showed a high Si, Al and Ca content. Infrared and Raman spectroscopy were key in revealing clear Si–O modes related signatures and a very significant presence of water (OH/H2O). A parallel with glassy silicate materials, but also with opal-A, was essential in the understanding of the fulgurite’s characteristics. In particular, Raman data evidenced the exofulgurite to have a high degree of depolymerization.

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(reproduced with permission from Bunch et al. (2012))

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Notes

  1. For additional XRF data from other type I, type II and type IV fulgurites, the interested reader is referred to the recent article by Roberts et al. (2019).

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Acknowledgements

Mr. William T. Walker is gratefully acknowledged for kindly providing first-hand information on the impact site.

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Correspondence to Pablo Martín-Ramos.

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Alte da Veiga, N.M.S., Martín-Gil, F.J., Martín-Gil, J. et al. Physico-chemical study of an exogenic fulgurite from a thunderstorm on 10th August 2013 in Dallas, TX. Phys Chem Minerals 48, 12 (2021). https://doi.org/10.1007/s00269-021-01134-w

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  • DOI: https://doi.org/10.1007/s00269-021-01134-w

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