Transparente bis transluzente erscheinen im Durchlicht oft orange und bläulich bei Betrachtung normal zum Durchlicht.
Dieses Phänomen wird Opaleszenz genannt Im Edelstein- u.
www.edelsteine.atTransparent and translucent Opals appear orange in transmitted light and bluish when viewed perpendicularly to the transmitted light.
This phenomenon is known as opalescence.
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