Corundum in Green Mica is green mica that contains corundum (ruby and sapphire). Corundum is the second hardest mineral after diamond and belongs to the group of rubies and sapphires. By the way, the formal name for ruby is "ruby corundum" and the formal name for sapphire is "sapphire corundum." Green mica has the meaning of "a stone of hope that illuminates the future," and is said to have a healing effect that gently unravels anxiety, confusion, and a heart that has lost faith in itself or is suffering from stress, and makes you feel positive. "Corundum in Green Mica," where various colors of corundum shine inside the deep green green mica, is very attractive.