![](http://satori.geociencias.unam.mx/public/journals/1/cover_issue_31_en_US.jpg)
Cover image:
Fulgurite Zacatecas. Fragments of skeletal crystals of Fe-silicate and two prismatic crystals (< 10 μ m) of Si-Fe (silicides) whiting the vitreous matrix. Scanning electron microcopy image; see related paper of Reyes-Salas et al. in this issue.
Published:
2017-11-29