ex. Dr. Mark Feinglos Collection A SHARP 4 mm crystal on matrix from this famous find. No doubt other species are on the matrix as well, but this mosch crystal is sharply and nicely displayed. I am told these were found in the 1800s but not identified as this new, rare mercury-silver species until 1938. Usually these go for a lot more money when they turn up, as matrix pieces are exceptionally rare.