I am a succulent known for my striking geometric patterns, often resembling a star. My leaves are thick, triangular, and form a rosette. I'm native to South Africa and prefer bright, indirect light and well-draining soil. What am I?

1. My leaves are often described as 'toothed' or 'serrated'.
2. I am slow-growing and relatively low-maintenance.
3. I am commonly found in rock gardens or as a houseplant.
4. I can propagate easily from leaf cuttings.