Silicates—including quartz ... Rubies are formed of a mineral called corundum, comprised of aluminum oxide. The red color is caused by traces of chromium. Corundum also forms sapphire in ...

The focus on alumina production aims to bolster the US aluminium ... silicate rocks, Brimstone aims to reduce the dependence of the US alumina industry on imported bauxite. Brimstone’s patented ...

This layer is sometimes called sial because its bulk composition is richer in aluminium silicates and has a lower density compared to the oceanic crust, called sima which is richer in magnesium ...

Electra Stone Ltd., a mining company, engages in the development and exploration of Nephrite Jade and industrial minerals. It primarily engages in mining the Apple Bay aluminum silicate quarry ...