Igneous rocks close igneous rockIgneous rocks are ... As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard crystalline rock.

Igneous rock is formed by the cooling of molten rock ... causing the minerals that compose the stone to re-form into new crystals. Sedimentary rock is formed by the accumulation of minerals and other ...

Right: OH-defects in young (0.3 Gyr) Variscan granites are one order of magnitude higher than in old (0.9-1.8 Gyr) Proterozoic granites from Scandinavia . The OH-content is reflected in recent ...

Igneous rocks contain randomly arranged interlocking crystals. The size of the crystals depends on how quickly the molten magma solidifies and can form extrusive igneous rocks or intrusive igneous ...