perlite

Perlite, obsidian and pitchstone are volcanic glass having the same compositions commonly with rhyolite as well as andesite and basalt.

珍岩、黑耀岩和松脂岩等玻璃质熔岩以酸性为，性者也常见。

The result indicated that transformation of perlite was accelerated and the quantities of ferrolites was increased under the function of impulse electric field at second stage graphitization.

进而分析脉冲电场作用体石墨晶核的数量增加,有效地缩光体分解时碳原子的扩散距离,从而加速第二阶段石墨化过程光体的转变。