Tiger iron jasper is a gemstone variety of jasper. It is a member of the quartz group, SiO2 and is a parallel growth of quartz, and amphibole fibres. The combination causes chatoyency, which is a term used to describe the reflective property that makes it so popular for use in making jewellery. One specimen is in its natural appearance, and the other specimen has been cut and polished to reveal a hidden beauty. Both specimens were collected from the same site in western Australia by Jim Nicholls, founder member of the club.