Information About Igneous Rocks

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The ancient Romans loved granite for its strength, using it in massive columns that still stand today. In Hawaii, Pele, the goddess of volcanoes, is believed to shape the land with her fiery temper. Locals sometimes leave offerings of ʻōhelo berries for her at volcanic craters.

And remember the giant moai statues on Easter Island? They’re carved from compressed volcanic ash—an igneous rock called tuff. Those eerie, silent faces are literally solidified eruptions from the Earth’s ancient mood swings.

Igneous Rock Formation Chart

Quick Reference: Three Igneous Rocks to Know

Granite: Light-colored, coarse-grained, perfect for high-end countertops and ancient pyramids. Basalt: Dark, fine-grained, forms the ocean floor and lunar seas (yes, the moon has them). Obsidian: Black, glassy, sharp, and beloved by obsidian knife collectors everywhere.

Want a fun experiment? Drop a piece of pumice into a glass of water. It floats. That’s because its density is lower than water—a rare trait for rock. It’s the only rock that can double as a bath sponge.