Hexyl.....don't feel too bad. Lithops are not a beginner's plant, but unfortunately, nurseries market them as such by giving them cute little names like "moon rocks". For future reference, the splitting is normal. Two new leaves emerge from the center of the plant, growing in the opposite direction from the outer ones. No water needs to be given because the newer leaves will get their moisture and nutrients from the old leaves. Believe it or not, they need very little water....as in, water them once or twice a year. I gave up growing them years ago because I couldn't keep them alive. Of course, I live in zone 5, so I don't think they liked being moved indoors and out according to the seasons. As for the different colorings, I've always found that the parts under the soil stay green while the heads turn colors depending on variety and amount of sun exposure.

Thank you for the response. I will probably purchase them again and grow them outdoors. I don't water them much. I live in Zone 9b, so I typically don't have to worry a lot. The lowest it ever got in the 18 years I have lived here is 19 degrees. It normally goes down to the high 30's and that's it. The frustrating thing about these plants is they are so slow to respond to any detrimental conditions that it takes a whole year to realize you're doing something wrong. This plant literally was watered 4 times per year and was not overwatered. I know you said once or twice per year, but I still don't think 4 times would be a lot either. It was sitting in a window box. It receives medium/bright light but never direct sun. I think these plants look way too etoliated. Those green parts were always above the soil. The plant was never in extreme heat either. I fear that similar things will happen to my other plants.