“Olive green gem andalusite crystal from the Jenipapo District, Minas Gerais, Brazil. The crystal is highly pleochroic in polarized light, changing from pale olive green to very dark forest green. Photographed with a Nikon Z7 camera using a Nikkor 105mm macro lens and a manual focusing rail. Composite image generated from 33 individual photos stacked using Helicon Focus image processing software. Chris Emproto collection and photo.”