What material is the Rosetta Stone made out of?

The Rosetta Stone is made of granodiorite, a coarse-grained igneous rock that is primarily composed of quartz, feldspar, and mica. This durable material was chosen for its strength and resistance to weathering, which has helped preserve the stone over millennia. The stone features inscriptions in three scripts: Greek, Demotic, and hieroglyphic, which were carved into its surface.