perlitic
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Related to perlitic: aphyric, Perlitic Structure
per·lite
also pearl·ite (pûr′līt′)n.
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.
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