At the end we have got the mineral opal.
It also consists of silicon dioxide, but it is amorph.
Because of water in opals they gleam in many different colors.
www.hpwt.deSchließlich gibt es noch das Mineral Opal.
Auch dieses besteht aus Siliciumdioxid, aber es ist amorph.
Durch eingelagertes Wasser schimmert Opal in vielen verschiedenen Farben.
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