As a child I tried with seeds to grow stones – daft kid or what? Now I do not see the fun in growing Lithopes, due to the early aversion thereapy, but each to their own.
Lithopes are succulents often collected by Cactus growers. Plants consist of one or more pairs of bulbous leaves and hardly any stem. The slit between the leaves  produces white or yellow flowers and new leaves. During winter a new leaf pair grows inside the existing fused leaf pair. The old leaf pair parts to reveal the new leaves and the old leaves will then dry up
I can’t beat the full description, history notes and cultivation report on the BBC web pages. In case the page gets taken down in a cost cutting exercise I have repeated some of the key content.
‘Growing Lithops at Home
More information from Lithops info. Read ‘Lithops- Flowering Stones’ by Desmond and Naureen Colefrom Amazon
Read more on gardenerstips.co.uk