Mundic is the old Cornish name for pyrites, a mineral found in abundance in some of the geological deposits in Cornwall and some parts of Devon. In the early 20th century, waste products from the area's mining industries found their way into blocks used for housing, and some of this waste material contained unstable sulphides (pyrite being one of the main culprits), which deteriorated after the concrete became carbonated, and in damp conditions. Surveyors will be able to test suspect buildings and advise on next steps.

Also known as Mundic testing