Take your leaves, and spread some cement over them. Knead it into dough thoroughly, and mix that in with alot of ammonia. Wear a breathing mask at this point(just sayin'). Mix in the same amount of unleaded gasoline, and continue to stir the fuck out of that for about half an hour, then let it sit for a day or three. After that, add baking soda and hydrochloric or sulfuric acid and stir, then cap the container, and let it sit for a little while. little crystals should form, and you fish those out with a spoon, and plop them into some tinfoil. Evaporate the rest of the liquid out and off of these crystals by using a lightbulb or the sun. After that, you can cut it up and have at it.