Rapakivi granite
- Rapakivi - a description, with photographs, on an Estonian geologist's website
- Wikipedia
- Building Stones - Rapakivi - the seventh of a set of 16 cards depicting building and ornamental stones. Produced by Fred Broadhurst, Richard Porter and Paul Selden for a University of Manchester distance-learning course
Imperial Mahogany granite
- Building Stones - Imperial Mahogany - the sixth of a set of 16 cards depicting building and ornamental stones. Produced by Fred Broadhurst, Richard Porter and Paul Selden for a University of Manchester distance-learning course