A mineral is a natural substance with a crystal structure.
Igneous Rock
Form from the cooling and solidification of molten material, either magma (underground) or lava (above ground). E.g. Granite, basalt.
Types of Igneous Rocks
Intrusive Igneous Rock - Forms beneath the earths surface from magma cooling. Much larger crystals can form. Often course grained.
Extrusive Igneous Rock - Formsabove the earths surface from lava cooling. Minimal crystal growth. Fine grained pr glassy.
Sedimentary Rocks
Formed from the accumulation and compression of sediments. E.g. Sandstone, Lime stone and Shale.
Metamorphic Rocks
Formed from pre-existing rocks that have undergone changes to heat and/or pressure. E.g.Marble, PhylliFormed from pre-existing rocks that have undergone changes to heat and/or pressure. E.g.Marble
