An approximately 1.5-cm crystal of chondrodite perched on a nice matrix with a spray of embedded clinochlore crystals as well. Incredibly fine, lustrous, and sharp crystals of chondrodite from this most historic and classic of localities for the species. Tilly Foster Mine, a large iron ore (magnetite) deposit discovered in 1810. The mine was 600 feet deep in 1879. Mining ceased in 1897, after 13 miners were killed in a rockslide.