Gfeltifish

I have not received the lump of coal yet, but the video says it weighs 28 grams (1 ounce). Can someone confirm it weighs this? If not, can it be split open? Or less simple, yet incredibly far of a stretch, pour acid on the coal to see if it reacts? http://www.justanswer.com/home-improvement/473k6-acid-poured-rock-coal-react.html