Pillow basalt is very dark, both as hardened rock and when it’s eroded into sand over time. “Most of the California coast is old seafloor stuff,” said Gary Griggs, author and professor of ...

black sand beaches intrigue travelers with their mystery and beauty. These beaches form over time by the erosion of volcanic materials such as lava fragments, basalt rocks or other minerals ...

Reynisfjara, located near the village of Vik, is famous for its jet-black volcanic sand, towering basalt columns, and the powerful Atlantic waves that crash against its shore. The dramatic sea ...