White Opal
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White Opal

OPU14F
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Product: Natural Opal, Shape: Oval cabochon, Color: White, Size: 16.30x9.80x8.90 mm, Weight: 8.15 carats, Clarity: Barely visible inclusions, Treatment: Untreated, Iridescence: Strong, Origin: Ethiopia

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525.00 lei
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  • Product: Natural Opal
  • Shape: Oval cabochon
  • Color: White
  • Size: 16.30x9.80x8.90 mm
  • Weight: 8.15 carats
  • Clarity: Opaque without visible inclusions
  • Iridescence: Strong
  • Treatment: Untreated
  • Origin: Ethiopia

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".

: OPU14F
Out of Stock
New

Data sheet

Stone type
Natural Opal
Shape
Oval cabochon
Colour
White
Iridescence
Strong
Stone size mm
16.30x9.80x8.90
Weight carat
8.15
Stone Clarity
Slightly visible inclusions
Treatment
No treatments
Source
Ethiopia
Sale information
Price by piece
Supplier
Gold and Gems

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