Natural sulphur ( sulfur ) mineral specimens collected from the volcanic regions of Bolivia. Sulphur is a bright yellow mineral and it is actually the 5th most common element on earth. It is often the characteristic odor of rotting eggs which can indicate the presence of sulphur even before it has been identified by eye. These eye catching specimens are supplied in a small ( 2.5 cm x 2.5 cm ) magnification box to enhance the viewing of the sample. It would make an interesting addition to any collection and is suitable for children over the age of seven.