单词	perlite
释义	perlite /ˈpəːlʌɪt / noun [mass noun] A form of obsidian consisting of glassy globules, used as insulation or in plant growth media.The mix we use contains compost, peat, perlite, rock phosphates, blood meal, calcite clay and gypsum.... With hot adhesives, however, it has to be paired with an insulation cover board of another type, such as perlite or wood fiber. These soil mixtures should include sand, peat moss, perlite, vermiculite, and fir bark for adequate drainage. Origin Mid 19th century: from French, from perle 'pearl'. Rhymes pearlite
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