Had these images for a while, though I would share. Interesting morphology for magnetite. The greyish material is tremolite. First image with Canon 50D, MP-E 65 and is a stack (1 cm FOV), ZS D-map, the others are single shots using a Canon 35-80 with the front element removed to get about 1x on sensor, crystal overall is about 2cm x 3cm. This is from the Grace Mine, Morgantown, Berks County, Pennsylvania - the mine shut down in 1977, so this must have been collected sometime before then (not by me).
Images taken in a controlled environment or with a posed subject. All subject types.