Étiquette : Australia's opal

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The most beautiful and the most expensive rocks: Opal

Beauty images, for you Rocks OPAL The most beautiful and the most expensive rocks Image source: opel.shoutwiki.com An opal is a mineral composed of hydrated silica (…), with traces of uranium, magnesium, calcium, aluminum, iron, arsenic, sodium and potassium. The water content is usually between 3 and 9%; it can reach 20% depending on the variety (…)It is made up of three very distinct … Lire la suite The most beautiful and the most expensive rocks: Opal