The Loch Doon, Cairnsmore of Fleet and Criffell granites and aureoles show considerable variation in their magnetic mineralogy and fabrics. The Loch Doon area has magnetite as the dominant magnetic mineral, while the Cairnsmore of Fleet area shows magnetite and hematite in different areas. The Criffell granite and immediately adjacent aureole are characterized by magnetite, but hematite predominates in the outer aureole and country rocks. Despite such differences, the magnetic fabric only shows effects of granitic emplacement within the thermal aureole, mostly within 200–300 m of the contact. Considerable variation in magnetic fabric is observed over small distances, but the granitic contacts are generally marked by a strong foliation parallel to the granite contact.