I first noticed this when I used a creeper to help me dig out a hill side of Basalt. When he blew, the rocks he left behind was of Diorite and Rhyolite, I found this odd seeing as this area only has Basalt. I created a creative game, made a floating platform and tested it again using a creeper (from the white egg that I assume is the one TFCraft uses) and once again I got Diorite and Rhyolite stones from it instead of Basalt stones. I reset the test with basalt cobblestone, basalt bricks and smoothed basalt, but its only the natural Basalt that gives the wrong stones. I switched to TnT and it still happened, so from there on I used TnT and a wooden presser plate to do the tests. next was to see if it happened with any other stone and here is what I got; Granite, Diorite and Gabbro gave Granite stone and cobblestone of there type (so Gabbro gave Granite stone and Gabbro cobblestone) Siltstone, Mudstone, Shale, Claystone, Rock Salt, Limestone, Conglomerate, Dolomite, Chert, and Chalk all gave Siltstone rocks and cobblestone of there own type. Quartzite, Slate, Phyllite, Schist, Gneiss and Marble gave Quartzite stone and cobblestone of there own type. The last 4 are kinda special. Rhyolite gave Rhyolite stone and Granite stone Basalt gave Rhyolite stone and Diorite stone Andesite gave Rhyolite stone and Gabbro stone Dacite gave Rhyolite stone and Siltstone stone These are special because unlike the others they dont drop cobblestone blocks, just 2 stone types. I want to make clear that when I say "<name> stone" Im talking about the item you gather by breaking surface rocks or mining with a pick axe, that when placed create a cobblestone block. When I say you get a cobblestone I mean you actually get the cobblestone version of that rock type, that you can't get normally get as an item. I only tested the cobblestone, smoothed and brick version of basalt, seeing as it didn't yield any oddities I didn't test any of the other stone types this way.

So I found a fun bug to abuse. When you have prepared ceramic mold in the forge - you take single clay mold and left-click with it on a ceramic one in the forge - you get your ceramic mold and clay one takes its place in the forge, BUT! It instantly becomes ceramic after that. And procedure can be repeated infinite amount of times. Works in SMP too. Addendum: Works with beef too. If you substitute cooked beef with raw one. Seems to be a major issue. Can anyone confirm it's not just me? Another addendum: Checked that it's not configs or other mods. Also - works only if you have coal under that slot. Scratch that, works only with freshly cooked stuff (meaning in current session or maybe current chunk update). Still - a bug nonetheless. Bug still works in B73. Also tested on glass.