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

珍珠、黑耀和等玻璃质熔以酸性为主，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矿是富含火山玻璃质的凝灰原地水解蚀变形成的膨润土矿床,矿床具中型规。

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.

为25%和50%的两种烧结矿中铁氧化物均以赤铁矿、磁铁矿为主，粘结相主要以铁酸钙、硅酸二钙和玻璃质为主，但铁酸钙数量不多。