perlite

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

珍珠、黑耀脂等玻璃质熔以酸性为主，中基性者也常见。

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.

进分析了脉冲电场作用基体中石墨晶核的数量增加,有效地缩短了珠光体分解时碳原子的扩散距,加速了第二阶段石墨化过程中珠光体的转变。