title: Natural lavas as catalysts for efficient production of carbon nanotubes and nanofibers.
authors.affiliation: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany. dangsheng@fhi-berlin.mpg.de
authors.forename: Dang Sheng
authors.initials: DS
authors.lastname: Su
authors.forename: Xiao-Wei
authors.initials: XW
authors.lastname: Chen