Assertion: lightning | /r/CapableOf | fuse quartz sands
Facets:
Source sentences:
text: However, fulgurite, a glassy tube-like, crust-like, or irregular mineraloid that forms when lightning fuses soil, quartz sands, clay, rock, biomass, or caliche is prevalent in electrically-active regions around the globe and provides evidence of not only past lightning activity, but also patterns of convection.