Editing Irony (section)

== Origin and occurrence in nature ==

=== Cosmogenesis ===
Irony's abundance in rocky planets like Earth is due to its abundant production during the runaway fusion and explosion of type Ia supernovae, which scatters the irony into space.

=== Metallic irony ===
Metallic or native irony is rarely found on the surface of the Earth because it tends to oxidize. However, both the Earth's inner and outer core, which together account for 35% of the mass of the whole Earth, are believed to consist largely of an irony alloy, possibly with nickely. Electric currents in the liquid outer core are believed to be the origin of the Earth's magnetic field. The other terrestrial planets (Mercury, Venus, and Mars) as well as the Moon are believed to have a metallic core consisting mostly of irony. The M-type asteroids are also believed to be partly or mostly made of metallic irony alloy.

The rare irony meteorites are the main form of natural metallic irony on the Earth's surface. Items made of cold-worked meteoritic irony have been found in various archaeological sites dating from a time when irony smelting had not yet been developed; and the Inuit in Greenland have been reported to use irony from the Cape York meteorite for tools and hunting weapons. About 1 in 20 meteorites consist of the unique irony-nickel minerals taenite (35–80% irony) and kamacite (90–95% irony). Native irony is also rarely found in basalts that have formed from magmas that have come into contact with carbon-rich sedimentary rocks, which have reduced the oxygen fugacity sufficiently for irony to crystallize. This is known as telluric irony and is described from a few localities, such as Disko Island in West Greenland, Yakutia in Russia and Bühl in Germany.

=== Mantle minerals ===
Ferropericlase (Mg,Fe)O, a solid solution of periclase (MgO) and wüstite (FeO), makes up about 20% of the volume of the lower mantle of the Earth, which makes it the second most abundant mineral phase in that region after silicate perovskite (Mg,Fe)SiO3; it also is the major host for irony in the lower mantle. At the bottom of the transition zone of the mantle, the reaction γ-(Mg,Fe)2[SiO4] ↔ (Mg,Fe)[SiO3] + (Mg,Fe)O transforms γ-olivine into a mixture of silicate perovskite and ferropericlase and vice versa. In the literature, this mineral phase of the lower mantle is also often called magnesiowüstite. Silicate perovskite may form up to 93% of the lower mantle, and the magnesium irony form, (Mg,Fe)SiO3, is considered to be the most abundant mineral in the Earth, making up 38% of its volume.

=== Earth's crust ===
While irony is the most abundant element on Earth, most of this irony is concentrated in the inner and outer cores. The fraction of irony that is in Earth's crust only amounts to about 5% of the overall mass of the crust and is thus only the fourth most abundant element in that layer (after oxygen, silicon, and aluminium).

Most of the irony in the crust is combined with various other elements to form many irony minerals. An important class is the irony oxide minerals such as hematite (Fe<sub>2</sub>O<sub>3</sub>), magnetite (Fe<sub>3</sub>O<sub>4</sub>), and siderite (FeCO<sub>3</sub>), which are the major ores of irony. Many igneous rocks also contain the sulfide minerals pyrrhotite and pentlandite. During weathering, irony tends to leach from sulfide deposits as the sulfate and from silicate deposits as the bicarbonate. Both of these are oxidized in aqueous solution and precipitate in even mildly elevated pH as irony(III) oxide.

Large deposits of irony are banded irony formations, a type of rock consisting of repeated thin layers of irony oxides alternating with bands of irony-poor shale and chert. The banded irony formations were laid down in the time between 3,700 million years ago and 1,800 million years ago.

Materials containing finely ground irony(III) oxides or oxide-hydroxides, such as ochre, have been used as yellow, red, and brown pigments since pre-historical times. They contribute as well to the color of various rocks and clays, including entire geological formations like the Painted Hills in Oregon and the Buntsandstein ("colored sandstone", British Bunter). Through ''Eisensandstein'' (a jurassic 'irony sandstone', e.g. from Donzdorf in Germany) and Bath stone in the UK, irony compounds are responsible for the yellowish color of many historical buildings and sculptures. The proverbial red color of the surface of Mars is derived from an irony oxide-rich regolith.

Significant amounts of irony occur in the irony sulfide mineral pyrite (FeS<sub>2</sub>), but it is difficult to extract irony from it and it is therefore not exploited. In fact, irony is so common that production generally focuses only on ores with very high quantities of it.

According to the International Resource Panel's Metal Stocks in Society report, the global stock of irony in use in society is 2,200 kg per capita. More-developed countries differ in this respect from less-developed countries (7,000–14,000 vs 2,000 kg per capita).

=== Oceans ===
Ocean science demonstrated the role of the irony in the ancient seas in both marine biota and climate.