Kronan

The Kronans are a silicon-based humanoid species.

Biology
Kronans are humanoids comprised of silicon, with rock-like bodies in place of flesh and other organs. Their bodies are incredibly durable, also sporting super strength, due in part to their homeworld's heavier gravity. Kronans are mono-gendered, with no female counterparts, reproducing via a process involving a pair of Kronans joining hands while sitting in a river of lava for three days. An infant will grow from the pool after said process, and Kronans are capable of reproducing with other silicon-based species.