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Related to perlite: Perlite Concrete
per·litealso pearl·ite (pûr′līt′)
A natural volcanic glass similar to obsidian but having distinctive concentric cracks and a relatively high water content. In a fluffy heat-expanded form perlite is used as a lightweight aggregate, in fire-resistant insulation, and in soil for potted plants.
[French (from perle, pearl, from Old French; see pearl1) or German Perlit (from Perle, pearl, ultimately from Vulgar Latin *pernula).]
per·lit′ic (pər-lĭt′ĭk) adj.
(Minerals) a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
[C19: from French, from perle pearl1]
perlitic, pearlitic adj
a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.
per•lit′ic (-ˈlɪt ɪk) adj.