So I was messing around with mod-making for a few days now and have come up with a pretty decent idea for a mod. I'm going to add a whole bunch of new ores to Minecraft. Not like ruby, and sapphire, but more unknown ones. I have added in 3 so far,(quartz, amethyst, kunzite). There is only one problem that I'm having. When I run Minecraft to test the mod, if you stand on one of the new blocks, you fall through the world forever. This is where I need some help. I can't quite seem to figure out how to fix it, so if any of you who read this are fairly decent at modmaking/coding, please reply. Thanks!