Igneous rocks close igneous rockIgneous rocks ... These crystals will grow and interlock to form a hard crystalline rock. Basalt is usually formed when lava solidifies on the earth’s surface ...

See projects featuring alabaster › Basalt Basalt is a dark-coloured igneous rock that is formed when lava cools rapidly. It is most frequently used as an aggregate for concrete as it is low-cost and ...

producing extrusive or volcanic igneous rocks like basalt. As magma cools, the minerals within it begin to crystallize and ...