Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%.
Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals.
It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt.
Opal is the birthstone of October, and the stone that celebrates the 14th anniversary of marriage.
The name opal is believed to be derived from the Sanskrit word upala , which means ‘jewel’, and later the Greek derivative opállios , which means ‘to see a change in color’.
There are two broad classes of opal: precious and common. Precious opal displays play-of-color (iridescence); common opal does not.
Play-of-color is defined as “a pseudo chromatic optical effect resulting in flashes of colored light from certain minerals, as they are turned in white light.”
The internal structure of precious opal causes it to diffract light, resulting in play-of-color.
Depending on the conditions in which it formed, opal may be transparent, translucent or opaque, and the background color may be white, black, or nearly any color of the visual spectrum.
Black opal is considered rarest, whereas white, gray, and green are the most common.