Home > Rock Forming Minerals – June 20 > MS1353 Foshagite

Foshagite - Sold

Foshagite is a hydrous calcium silicate mineral. Eakle (1925) named the species in honor of William F. Foshag (1894-1956) curator of mineralogy at the Smithsonian Institution, Washington, D.C. Gard & Taylor (1958) used a combination of X-ray diffraction, electron diffraction and chemical analysis to establish the currently accepted formula for the mineral.

On this specimen, foshagite forms veinlets cutting compact massive vesuvianite. Foshagite forms stark white fibers, grown tightly together in parallel. This habit is characteristic of the species. Collecting at Crestmore has been severely limited (or perhaps forbidden) for a couple of decades, so new material is not entering the market.