Basalt

noun
  1. A dark, fine-grained volcanic rock that sometimes displays a columnar structure. It is composed mainly of plagioclase and pyroxene minerals and is the most common rock type in the Earth's crust. noun
    The cliffs were made of basalt, giving them a dark, imposing appearance.
    Basalt is often used in construction due to its durability and strength.
  2. A type of lava that is low in silica and erupts at high temperatures, typically forming basalt rock upon cooling. noun
    The volcano erupted, spewing basalt lava across the landscape.
    Basalt lava flows are common in many volcanic regions around the world.