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主，中基性者也常见。

Zhaocun bentonite deposit oringnated from tuff rich in volcanic hyalocrystalline,which underwent hydrolysis and alteration in Changxing county,Zhejiang province.The deposit has middle scale.

浙江省长兴县赵村膨润土是富含火山玻璃质的凝灰岩原地水解蚀变形成的膨润土床,床具中型规模。

For sinter with 25% and 50% MAC fines the iron oxides mainly consisted of hematite and magnetite, the bonding phase were mainly dicalcium silicate, glassiness, and a few amount of calcium ferrite.

配比为25%和50%的两种中铁氧化物均以赤铁、磁铁为主，粘相主要以铁酸钙、硅酸二钙和玻璃质为主，但铁酸钙数量不多。