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There are also two in the pit in lost izalith with the man eaters and poison

One is in the pit itself, while the other is on one of the platforms that can be accessed from a staircase in the pit
Crystal lizards in Lost Izalith will also drop them
The Black Knights in undead burg and parish drop regular chunks if I recall correctly, and the black knights in tomb of the giants and darkroot basin drop blue chunks. The axe knight in catacombs drops white chunks. The only ones that drop reds are the two in undead asylum and the GS knight in kiln.
It turns out the Black Knight in the Catacombs dropped a white chunk for me. This page contains mis-information.