The originals of the nuggets shown on this pages might be admired at the Mineralogy Exhibition of the ETH Zuerich / Switzerland.
Details about the photographs: Pictures were taken at a focal length of 300 mm with a lense with macro focusing capability. There was a exposure time of about 8 - 10 s at the minimum aperture (F 32). - So, don't forget your tripod! ☺
After scanning the slides on a KodakPhotoCD, photographs were adapted with a standard image-editing program.