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Perlite perlite is a kind of glassy rock formed by volcanic eruption of acid lava and rapid cooling. It is named for its pearl fissure structure. Perlite ore includes perlite, obsidian and turpentine. The difference between the three is that perlite has circular arc cracks formed by condensation, which is called perlite structure, with a water content of 2 ~ 6%; Turpentine has unique turpentine luster, with water content of 6 ~ 10%; Obsidian has glass luster and shell fracture, and the water content is generally less than 2%.