More on igneous rock from Fact Monster:

• rock - rock rock, aggregation of solid matter composed of one or more of the minerals forming the ...
• rock: Igneous Rocks - Igneous Rocks Igneous rock originates from the cooling and solidification of molten matter from the ...
• porphyry, igneous rock - porphyry porphyry , igneous rock composed of large, conspicuous crystals (phenocrysts) and a ...
• chromite - chromite chromite , dark brown to black mineral. It is an iron-chromium oxide, FeCr2O4, with traces ...
• Rocks - Rocks Rocks are classified in three types based on how they are formed. Igneous rocks are formed ...

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