ETYMOLOGY: From the hindu "upala" = stone changes the color. ANDINO: of Peru, in the area of the Andes, hence its name.
CRYSTAL SYSTEM: Amorphous.
PRINCIPLE OF FORMATION: Secondary.
CLASS MINERAL: Silicates.
CHEMICAL FORMULA, MINERAL ELEMENTS: SiO2 · nH2O.
HARDNESS: 5.5 - 6.5 on the Mohs scale.
MINERALOGY: The group Opal distinguish between nobles opalescent opals, opals red yellow fire and common opals. The properties vary considerably. The opal is secondarily formed as a result of solidification of silicic acid gel by dehydration. Since silicic acid gel forms droplets silicon dioxides microspheres are formed. (20% water and gas). The opal color play is due to the phenomenon of light refraction in the microspheres of cristobalite.
MYTHOLOGY: The common opal, also called potch, in Greek mythology was said to come from the tears of the fate of Zeus after the victory over the Titans. India is the goddess of the rainbow solidified in stone when he fled from the gods angry. Opal cristobalite has small areas included in a mass of hydrated silica gel, when these small areas are of equal size and an ordered three-dimensional distribution of the optical effect opalescence occurs, however when the small spheres are of different sizes and they are arranged irregularly opalescent effects not present.
PROPERTIES: It is said that the Andean Opal helps to think, speak and act on the fly, enhances self-esteem, can act as an emotional stabilizer helps to express positive emotions, white mineral enhance clarity and purity and knowledge of one Also, the white mineral provide fullness and perfection, it is a protector on the spiritual journey, it helps you select correctly and helps you to visit the places you most want to go. It has also been used to induce the hypnotic state and allow divination.
ZODIAC SIGN: Cancer.
USES: Jewellery, meditation, collection, powder is used as an abrasive.