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 many colors, which generally come from ...

Myanmar’s rich mineral deposits come with a sobering backdrop. Decades of political instability, military control, and human rights abuses cast a shadow over its gemstone trade. Mining practices ...

The rarest mineral in the world is kyawthuite (Photo: mindat) Cost of kyawthuite The cost of the new rarest mineral in the world remains a mystery. However, its predecessor, which was listed in ...