Color postcard from circa 1960-1970 of children posing with abandoned grindstones in Grindstone City, Michigan. The city was founded around the grindstone quarries, with its primary industry focused on this finest of abrasive stones. The rock (a form of sandstone) was quarried and turned, being carved into the grindstones shown in this image. After World War I, carborundum replaced grindstone, destroying the industry of the town and the town itself. The city is also spelled Grind Stone City in some sources.