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- Pigeonite abstract "Pigeonite is a mineral in the clinopyroxene group. It has a general formula of (Ca,Mg,Fe)(Mg,Fe)Si2O6. The calcium cation fraction can vary from 5% to 25%, with iron and magnesium making up the rest of the cations.Pigeonite crystallizes in the monoclinic system, as does augite, and a miscibility gap exists between the two minerals. At lower temperatures, pigeonite is unstable relative to augite plus orthopyroxene. The low-temperature limit of pigeonite stability depends upon Fe/Mg ratio in the mineral and is hotter for more Mg-rich compositions; for a Fe/Mg ratio of about 1, the temperature is about 900 °C. The presence of pigeonite in an igneous rock thus provides evidence for the crystallization temperature of the magma, and hence indirectly for the water content of that magma.Pigeonite is found as phenocrysts in volcanic rocks on Earth and as crystals in meteorites from Mars and the Moon. In slowly cooled intrusive igneous rocks, pigeonite is rarely preserved, but textural evidence of its breakdown to orthopyroxene plus augite may be present, as shown in the accompanying microscopic image.Pigeonite is named for its type locality on Lake Superior's shores at Pigeon Point, Minnesota, United States. It was first described in 1900.".
- Pigeonite thumbnail PyroxeneExsol_0.5mmm.jpg?width=300.
- Pigeonite wikiPageID "4167941".
- Pigeonite wikiPageRevisionID "585921593".
- Pigeonite 2v "0".
- Pigeonite birefringence "δ = 0.021 - 0.030".
- Pigeonite caption "Polarized light microscope image of part of a grain of orthopyroxene containing exsolution lamellae of augite The texture documents a multistage history: crystallization of twinned pigeonite, followed by exsolution of augite; breakdown of pigeonite to orthopyroxene plus augite; exsolution of augite parallel to the former twin plane of pigeonite.".
- Pigeonite category Pyroxene.
- Pigeonite category Silicate_minerals.
- Pigeonite cleavage "Good on {110}, ^ ~87°".
- Pigeonite color "Brown, greenish brown-black".
- Pigeonite dana "65.01".
- Pigeonite diaphaneity "Semitransparent".
- Pigeonite dispersion "weak to distinct".
- Pigeonite formula "Si2O6".
- Pigeonite fracture "Conchoidal".
- Pigeonite gravity "3.17".
- Pigeonite habit "Prismatic crystals, to 1 cm; granular, massive.".
- Pigeonite hasPhotoCollection Pigeonite.
- Pigeonite luster "Vitreous to dull".
- Pigeonite mohs "6".
- Pigeonite name "Pigeonite".
- Pigeonite opticalprop "Biaxial".
- Pigeonite pleochroism "Weak to moderate; X = colorless, pale green, brown; Y = pale brown, pale brownish green, brownish pink; Z = colorless, pale green, pale yellow".
- Pigeonite refractive "nα = 1.683 - 1.722 nβ = 1.684 - 1.722 nγ = 1.704 - 1.752".
- Pigeonite streak "Grey white".
- Pigeonite strunz "9".
- Pigeonite symmetry Hermann%E2%80%93Mauguin_notation.
- Pigeonite symmetry "Monoclinic prismatic".
- Pigeonite symmetry "Space group: P 21/c".
- Pigeonite system Monoclinic_crystal_system.
- Pigeonite tenacity "Brittle".
- Pigeonite twinning "Commonly twinned simply or multiply on {100} or {001}".
- Pigeonite unitCell "a = 9.7 Å, b = 8.95 Å, c = 5.24 Å; β = 108.59°; Z = 4".
- Pigeonite subject Category:Calcium_minerals.
- Pigeonite subject Category:Iron_minerals.
- Pigeonite subject Category:Magnesium_minerals.
- Pigeonite subject Category:Pyroxene_group.
- Pigeonite type Abstraction100002137.
- Pigeonite type CalciumMinerals.
- Pigeonite type IronMinerals.
- Pigeonite type MagnesiumMinerals.
- Pigeonite type Material114580897.
- Pigeonite type Matter100020827.
- Pigeonite type Mineral114662574.
- Pigeonite type Part113809207.
- Pigeonite type PhysicalEntity100001930.
- Pigeonite type Relation100031921.
- Pigeonite type Substance100019613.
- Pigeonite type ChemicalSubstance.
- Pigeonite type Mineral.
- Pigeonite type ChemicalObject.
- Pigeonite type Thing.
- Pigeonite comment "Pigeonite is a mineral in the clinopyroxene group. It has a general formula of (Ca,Mg,Fe)(Mg,Fe)Si2O6. The calcium cation fraction can vary from 5% to 25%, with iron and magnesium making up the rest of the cations.Pigeonite crystallizes in the monoclinic system, as does augite, and a miscibility gap exists between the two minerals. At lower temperatures, pigeonite is unstable relative to augite plus orthopyroxene.".
- Pigeonite label "Pigeoniet".
- Pigeonite label "Pigeonit".
- Pigeonite label "Pigeonita".
- Pigeonite label "Pigeonite".
- Pigeonite label "Pigeonite".
- Pigeonite label "Pigeonite".
- Pigeonite label "ピジョン輝石".
- Pigeonite sameAs Pigeonit.
- Pigeonite sameAs Pigeonita.
- Pigeonite sameAs Pigeonite.
- Pigeonite sameAs Pigeonite.
- Pigeonite sameAs ピジョン輝石.
- Pigeonite sameAs Pigeoniet.
- Pigeonite sameAs m.0bmtm7.
- Pigeonite sameAs Q425175.
- Pigeonite sameAs Q425175.
- Pigeonite sameAs Pigeonite.
- Pigeonite wasDerivedFrom Pigeonite?oldid=585921593.
- Pigeonite depiction PyroxeneExsol_0.5mmm.jpg.
- Pigeonite isPrimaryTopicOf Pigeonite.
- Pigeonite name "Pigeonite".