Reference: OPU5F
Product name: Natural Opal, Shape: Round, Color: White, Stone size: 7.00 mm, Weight: 0.70 - 0.90 carats, Stone clarity: Opaque without visible inclusions, Iridescence: Strong, Treatment: Untreated, Origin: Ethiopia
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Opal (from Latin opalus which probably comes from Sanskrit upalus = "precious stone") is an exceptional mineral that is only amorphous, being a hydrated silicate with the chemical formula SiO2*nH2O.
As the percentage of water can reach 25% as an amorphous solid body, the opal appears like glass without having a crystalline structure.
The mineral frequently appears in nature as the filling of a vein, or as granules. Opals are very rare, so they are not exploited industrially. Opal has been found on all continents but 97% of opals come from Coober Pedy, South Australia.
Not long ago, significant opal deposits were discovered in the Welo region of Ethiopia
The color of the mineral is very variable, from colorless to grey, red, brown, yellow, rarely due to some impurities, orange or reddish copper (called "fire opals").
The expression "opalescence" is a fascinating play of colors, which is formed by the phenomenon of light interference caused by the microcrystals of the mineral, a phenomenon found in the Cristobalite or Tridymite quartz variants, both variants are a quartz transformed at high temperatures of over 1470 °C.
The variant of "wood opal" is formed by the phenomenon of impregnating wood with silicates
Hydrophane or "water opal" exhibits a play of light colors similar to water.
Opal in Roman culture was considered the "stone of love" or the "stone of hope".
Data sheet
Product name: Natural Opal, Shape: Round, Color: White, Stone size: 7.00 mm, Weight: 0.70 - 0.90 carats, Stone clarity: Opaque without visible inclusions, Iridescence: Strong, Treatment: Untreated, Origin: Ethiopia
Product name: Natural Opal, Shape: Oval cabochon, Color: White, Size: 16.80x9.80 mm, Weight: 5.05 carats, Clarity: No visible inclusions, Treatment: Untreated, Iridescence: Strong, Origin: Ethiopia
Stone type: Natural Peridot, Shape: Oval, Color: Green, Stone size mm: 8.10x6.00, Weight carat: 1.05 - 1.45, Stone Clarity: Eye clean, Treatment: Untreated, Source: Pakistan
Product name: Natural Opal, Shape: Oval cabochon, Color: Yellow Orange, Stone size mm: 6.90x4.90 mm, Weight: 0.50 carat, Stone clarity: Opaque without visible inclusions, Treatment: Untreated, Iridescence: Medium, Origin: Ethiopia
