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low silicate rock (about 50% silicates) which tends to be dark coloured

Silicate rich rock (70% or more silicates) which tend to be light coloured

igneous texture which has clearly visible mineral grains (i.e. granite)

igneous texture which has NO visible mineral grains (i.e. basalt)

Igneous rock which is intrusive in origin and therefore phaneritic in texture

Igneous rock which is extrusive in origin and therefore aphanitic in texture

Igneous rock which is formed beneath the Earth's surface and is therefore phaneritic in texture

Igneous rock which is formed above the Earth's surface (including above the surface of the seafloor) and therefore aphanitic in texture.