Perlite
[pur-lahyt] /ˈpɜr laɪt/
noun, Petrography.
1.
a volcanic glass in which concentric fractures impart a distinctive structure resembling masses of small spheroids, used as a plant growth medium.
/ˈpɜːlaɪt/
noun
1.
a variety of obsidian consisting of masses of small pearly globules: used as a filler, insulator, and soil conditioner
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