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singida tanzanian zircon Why can Opal change color?

Posté le par Joyjy

Opal has many names, mainly “white gem” et “fancy stone”. In the south of my country, it is called “flashing mountain cloud”, which comes from Australia’s famous producing area “Lightning Ridge”. Opal is listed as the birthstone of October by the international jewelry industry, symbolizing hope and happiness.

Opal is the most colorful of gemstones. Ancient Roman natural scientist Pliny said: “… Opals are colorful and beautiful. Some Euro 1 white stones are as beautiful as a painter’s palette, and others are as beautiful as a painter’s palette. In the flame of sulfur or the tongue of fuel.”

The biggest advantage of opal (precious opal) is that it has brilliant and dazzling color, appelé “changement de couleur”.

A long time ago, due to the limitation of the level of science and technology, people have always been unclear about the reason why opal changed color. Even if the opal is magnified to 2000 times with an optical microscope, there is nothing special about it. Plus tard, scientists used an electron microscope to magnify Opal to more than 10,000 times before discovering its mystery. The opal originally used as the raw material of opal can be divided into two categories: one is the precious opal with “changement de couleur”; the other is the ordinary opal without color change. Noble opal is composed of countless tiny amorphous silicon dioxide spheres. The diameters of the small spheres are the same or similar, and they can be arranged neatly in a three-dimensional space. These neatly arranged small balls are like gratings. When white light hits it, it diffracts and disperses into a colored spectrum.

For ordinary opal, it is also composed of small silica balls, but the diameters of the small balls are different, the distribution is disorderly, and the arrangement has no certain direction, so it will only show a dim white color, so it cannot be used as a gem material.

 

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