Obsidian

The main chemical composition is as follows:

SIO2: 71.27% Al2O3: 11.42% CaO: 1.21% MgO: 0.24%

Fe2O3: 2.32% K2O: 2.48% Na2O: 4.68% other: 6.38%

Mainly color is black,it can be widely used in metallurgy, fossil, power and construction and other fields.

Per month: 2000MT