melteigite
melteigite An undersaturated, intrusive igneous rock containing essential nepheline and alkali pyroxene (aegirine or aegerine-augite) and displaying a colour index of 70–90. With decreasing mafic mineral content and increasing nepheline content melteigites pass into ijolites and then into urtites. All three rock types are essentially feldspar-free, undersaturated syenites (see SILICA SATURATION) and are well displayed in the Fen intrusive complex of southern Norway.
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Intermediate Rock , Skip to main content Syenite , syenite A saturated, coarse-grained, igneous rock consisting of essential alkali feldspar and ferromagnesian minerals (biotite, hornblende, arfvedson… Arenaceous , arenaceous Sandy, or sand-like in appearance or texture. The term is applied to clastic sedimentary rocks with a grain size of 0.0625–2.00 mm. Three… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… display , dis·play / disˈplā/ • v. [tr.] make a prominent exhibition of (something) in a place where it can be easily seen: the palace used to display a series…
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melteigite