| Sinkankas, John (1997) Gemstones of North America Vol. 3. Geoscience Press, Inc., Tucson, AZ. Phillips, K.A. (1978) Minerals of Manitoba - Volume I: Non-metallic and pegmatitic. MRD Educational Series ES78-1. Manitoba Mineral Resources Division Ormerod, M. J., M.D. (1964) Gemstones of Manitoba: Lapidary Journal, v.18, no. 6, p. 704. |
Souris gravel pit, Souris, Manitoba, Canada