A good way to show off specimens with different viewpoints (such as UV reactive).
Click on the image below for a higher resolution version and use the slider to see specimen under white light and longwave UV.
Colourless but iron-stained fluorite crystals. Fluorescent blue under longwave UV. Width of view 11.5mm. Stack of 40 images (white light) and 30 images (UV). Steve Sorrell specimen and photos.