How does perlite's texture affect its use? Perlite Texture and its Applications Perlite's texture is a key factor determining its suitability for various applications. The texture changes significantly depending on whether it's in its raw or expanded form. Before expansion, perlite exists as a volcanic glass with a granular texture, described as having a waxy to pearly luster. This raw material, which can be various colors including gray, green, brown, blue, or red, is not typically used directl