The heat-induced conversion of limonitic residues to hematite in surface-reaching inclusions provides another useful clue to heat treatment in corundum. Because this alteration happens at such a low ...
Mkango Resources Ltd. (LON:MKA – Get Free Report) shares shot up 6.9% during trading on Monday . The company traded as high as GBX 7.50 ($0.09) and last traded at GBX 6.63 ($0.08). 1,222,187 shares ...
The September birthstone is sapphire – a gem that’s been cherished for thousands of years. Although the term sapphire usually refers to the blue variety of corundum (ruby is the red variety), this ...