Atomic resolution transmission electron microscopy visualisation of channel occupancy in beryl in different crystallographic directions
Carina Silke Hanser,
Per Erik Vullum,
Antonius Theodorus Johannes van Helvoort
et al.
Abstract:The causes of colour in beryl have been a research topic for decades. For some varieties, such as emerald (green, coloured by Cr3+ and/or V3+), the main cause of colour is substitutions by metal atoms within the framework. However, the causes for the yellow and blue colours in heliodor, golden beryl and aquamarine are still debated. It is generally agreed that Fe ions are responsible for the colour, but there are differing conclusions about the valence states of these ions, the occupied positions and the colou… Show more
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