To celebrate the quarter pole of the year in deskcrops and outcrops (and the fact that I’m temporarily caught up with posting again), I’m breaking out a nice piece of Gore Mountain garnet for today’s deskcrop. Remarkably large garnets have historically been mined for use in abrasives at the Barton Garnet Mine, just west of Gore Mountain in New York’s Adirondack Mountains. This mine is world famous for its huge garnets (up to a meter in diameter). They occur in an amphibolite grade metagabbro and often the garnets have coronas of hornblende or plagioclase. Alas, most are fractured and not of gem quality. Nonetheless they make a colorful deskcrop that no geologist should be without.
Explore this and all of my 2010 Deskcrops and Outcrops in Google Earth!