I personally like Brimstone for the Red. And Soul Sand for the "Dirt." Because it looks like faces, trapped souls. Trapped dead creeper souls. Slow mud just sounds stupid. If Obsidian had to be renamed, it'd be like calling it "Hard rock." Not very creative.
Yellow glowing stuff can be whatever the hell it wants to be in the mean time until something interesting comes about. Demon Tears, or Magic Glowing Crazy Sponge Rocks or whatever.
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Science is good when it teaches you how to turn a million ungrateful foreigners into glass.