In petrological views, perlite is in hydrous rhyolite’s group with pearl luster. The expanded perlite which has material of weightless, that it comes from a moment heating of perlite (temperature 700-1200 °c ) and the combined water is most important parameter, on this production. It works in so many in so many ways as like as ; weightless instrument; agriculture; filter aids for liquids/solid and gas seperation; cementing on oil wells; filler, … . The expanded perlite has a grate future.The location of the mines studied is 28Km south of Nir on the Ardabil province. It comes from rhyolite volcanism on Miosen era. The region is during the period of the middle Miocen era, has important stress and the result of this stress are horst and graben and evaporative sedimentary rocks completely changed and produced gypsum domes. In this case it is well known that this stress makes lava comes out, especially rhyolite lava and perlite whose have very narrow relationship with this rocks so produced in this region, so between the producing of perlite and the tectonic region has grate relation. The perlite of this region is one of the hydrous rhyolite types in petrology view, and has 3.32% of water and classified as one of the best perlite. Against of Tabriz region-on Mianeh with classic texture-Nir perlite has flow or trachytic texture, most compact and has glassy fabric. On the microscopic study, feldspar discovered. Then after XRF, XRD and expansion test, it discovered that this perlite mine is in good condition than the other mines.