Thermoelectric materials are attracting increasing attention due to their potential for waste heat energy recovery. The challenge in finding better thermoelectric materials lies on their highly unusual combination of physical properties: a good thermoelectric material must be a good electrical conductor and simultaneously a poor heat conductor. Bornite, which is a copper mineral containing only abundant and cheap elements, has been very recently identified as a potential thermoelectric material, owing to its extremely low thermal conductivity. The current proposal, which is associated with a recently funded ISIS Facility Development Studentship, seeks to investigate the origin of the extremely low thermal conductivities in this material, as well as understanding the effect of doping on the local structure and cation ordering.