The name of this stone comes from the Latin upalus, which, in turn, is derived from the Sanskrit word upala – “precious stone”. This indicates that opal first came to Europe from India. In ancient Rome the word pronounced opalus, which means a stone consisting of parts, most accurately guessing the nature of opal. Opals are really very beautiful gemstones. Pliny described them as frozen drops of rain.
Opal is an amorphous variety of quartz, formed by homogeneous microscopic silica grains, which can be seen only with the help of an electron microscope. The final color of the stone is determined by the distribution of these grains and the amount of water between them (the content of the water varies from 3 to 21%). You know, opal is able to absorb the liquid of any consistency and color, so its tone varies depending on the color of the liquid. The main opal deposits are in Australia and in Mexico. Beautiful samples of milk opal are found in China.