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opal black oval x mm cab aaa thb - Newest pictures
gemstones.peperonity.net

☹The Gemstone Opal☹

Opal is the most colorful of gems. Its splendid play of color is unsurpassed, and fine examples can even be more valuable than Diamond. The play of color consists of iridescentcolor flashes that change with the angle at which the stone is viewed. This phenomenon is often called opalescence. The play of color may consist of large, individual flashes of color (known as schillers), or may be of tiny, dense flashes. The intensity and distribution of the color flashes is a determining factor in the value of an Opal.
Chemical FormulaSio2· nH2O
ColorWhite, Colorless, Blue, Red, Green, Yellow, Orange, Brown, Pink, Purple, Gray, Black, Banded, Multicolored
Hardness5.5 - 6.5
Crystal System Amorphous
Refractive Index1.37 - 1.47
SG1.98 - 2.25
Transparency Transparentto translucent
Double RefractionNone
Luster Vitreous, pearly, waxy
CleavageNone
Mineral Class Opal


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