Template:Potd/2018-01-16 (en)
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![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Fluorescence_in_calcite.jpg/300px-Fluorescence_in_calcite.jpg)
![](https://upload.wikimedia.org/wikipedia/commons/thumb/3/39/Fluorescence_in_calcite.jpg/300px-Fluorescence_in_calcite.jpg)
This is the English translation of the Picture of the day description page from 16 January 2018.
Descriptions in other languages:
This is the English translation of the Picture of the day description page from 16 January 2018.
Descriptions in other languages: