Obsidian, for example, is glassy- it forms very quickly and has very little porosity.
(it; has; very little porosity) (it; forms very quickly; ) Context(it forms very quickly,List([34, 55))):(Obsidian; is; glassy)
it forms very quickly,List([34, 55))
it it Obsidian
has forms very quickly is
very little porosity
glassy