Mineral(s): Grossular Garnet, Diopside Location: Jeffrey Mine, Val-des-Sources, Les Sources RCM, Estrie, Québec Size: 5.7 x 4.5 x 1.2 cm Description: This exceptional specimen features multiple (12+) gemmy, transparent, salmon pink hessonite garnet crystals on a matrix of light green diopside. Hessonite Garnet from the Jeffrey Mine holds a special appeal for collectors and gemstone enthusiasts alike. The mine’s limited production and its closure in 2011 make these specimens increasingly rare and sought-after. The garnet crystals are undamaged and the specimen is in very good condition overall. The Jeffrey mine began operation for asbestos in 1879. In 1950 an attempt was made to extract asbestos underground, but this method was abandoned after 10 years. In 1969 the pit was expanded, requiring the relocation of the adjacent town. However, world demand for asbestos fell drastically in the 1980s when its carcinogenic properties became known and worldwide bans were implemented on its use as a building material. In 1996, in an attempt to mine a high-grade area at the bottom of the pit, another attempt was made to switch to underground methods, but government subsidies were exhausted in 2001, and since then the mine has been inactive.
