Mexican Fire Opal Orange Rondell Faceted Natural Beads 16 inches StrandsOpal is a mineraloid or crystalline form of silica. It is colorless when pure. The Precious forms of Opal occur in a wide variety of colors, including white, yellow, red, orange, green, black, and blue. Opals are translucent or transparent and measure between 5 and 6 on the Mohs scale of hardness. Opal is a delicate stone with a subtle vibrational energy. Opal is believed to enhance your cosmic consciousness and strengthen your mystical and psychic