`corundum` Related Article Results

Ruby is a precious gemstone belonging mineralogically to the corundum group and characterized by its red color. This mineral, with the chemical formula Al₂O₃, acquires its distinctive red hue due to the presence of chromium. With a hardness of 9 on the Mohs scale, it is one of the hardest natural minerals after diamond. Throughout history, ruby has been valued in various cultures for both its aesthetic appeal and symbolic meanings. Mineralogical Properties and Geochemical Structure Ruby is the r