Mineralpedia Details for Gaidonnayite
Named for Gabrielle Donnay, a former professor and mineralogist at McGill University in Montreal, Quebec, Canada. Gaidonnayite is a rare mineral that occurs in Canada, the United States, Russia, Brazil, and a couple others. At its type locality at Mont Saint-Hilaire, it is found “in miarolitic cavities in nepheline syenite and altered pegmatite dikes in an intrusive alkalic gabbro-syenite complex” and in augite syenite at the mineral’s locality at Narssarssuk in Greenland. Commonly, Gaidonnayite will fluoresce bright green under shot-wave and long-wave ultraviolet light.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/gaidonnayite.pdf
Gaidonnayite from Mont Saint-Hilaire, Rouville Co., Quebec, Canada
Equant tiny glassy, yellow crystal to about 0.5mm in vug.