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- Lonsdaleite abstract "Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice. In nature, it forms when meteorites containing graphite strike the Earth. The great heat and stress of the impact transforms the graphite into diamond, but retains graphite's hexagonal crystal lattice. Lonsdaleite was first identified in 1967 from the Canyon Diablo meteorite, where it occurs as microscopic crystals associated with diamond.Hexagonal diamond has also been synthesized in the laboratory (1966 or earlier; published in 1967) by compressing and heating graphite either in a static press or using explosives. It has also been produced by chemical vapor deposition, and also by the thermal decomposition of a polymer, poly(hydridocarbyne), at atmospheric pressure, under argon atmosphere, at temperature 110 °C (230 °F).It is translucent, brownish-yellow in color, and has an index of refraction of 2.40 to 2.41 and a specific gravity of 3.2 to 3.3. Its hardness is theoretically superior to that of cubic diamond (up to 58% more) according to computational simulations but natural specimens exhibited somewhat lower hardness through a large range of values (from 7 to 8 on Mohs hardness scale), a speculation based on the fact that the samples were ridden with lattice defects and impurities.".
- Lonsdaleite thumbnail Lonsdaleite.png?width=300.
- Lonsdaleite wikiPageExternalLink hexdia.html.
- Lonsdaleite wikiPageExternalLink lonsdaleite.html.
- Lonsdaleite wikiPageExternalLink Lonsdaleite.shtml.
- Lonsdaleite wikiPageExternalLink min-2431.html.
- Lonsdaleite wikiPageExternalLink dn16610-diamond-no-longer-natures-hardest-material.html.
- Lonsdaleite wikiPageID "18087".
- Lonsdaleite wikiPageRevisionID "602127748".
- Lonsdaleite caption "Crystal structure of lonsdaleite".
- Lonsdaleite color "Gray in crystals, pale yellowish to brown in broken fragments".
- Lonsdaleite diaphaneity "Transparent".
- Lonsdaleite formula "C".
- Lonsdaleite gravity "3.2".
- Lonsdaleite habit "Cubes in fine-grained aggregates".
- Lonsdaleite hasPhotoCollection Lonsdaleite.
- Lonsdaleite luster "Adamantine".
- Lonsdaleite mohs "7".
- Lonsdaleite name "Lonsdaleite".
- Lonsdaleite opticalprop "Uniaxial".
- Lonsdaleite refractive "n = 2.404".
- Lonsdaleite strunz "1".
- Lonsdaleite symmetry Hermann%E2%80%93Mauguin_notation.
- Lonsdaleite symmetry "Hexagonal dihexagonal dipyramidal".
- Lonsdaleite symmetry "Space group: P 63/mmc".
- Lonsdaleite system Hexagonal_crystal_system.
- Lonsdaleite unitCell "a = 2.51 Å, c = 4.12 Å; Z=4".
- Lonsdaleite subject Category:Carbon_forms.
- Lonsdaleite subject Category:Meteorite_minerals.
- Lonsdaleite subject Category:Native_element_minerals.
- Lonsdaleite subject Category:Superhard_materials.
- Lonsdaleite type Abstraction100002137.
- Lonsdaleite type CarbonForms.
- Lonsdaleite type Form106290637.
- Lonsdaleite type LanguageUnit106284225.
- Lonsdaleite type Material114580897.
- Lonsdaleite type Matter100020827.
- Lonsdaleite type MeteoriteMinerals.
- Lonsdaleite type Mineral114662574.
- Lonsdaleite type NativeElementMinerals.
- Lonsdaleite type Part113809207.
- Lonsdaleite type PhysicalEntity100001930.
- Lonsdaleite type Relation100031921.
- Lonsdaleite type Substance100019613.
- Lonsdaleite type SuperhardMaterials.
- Lonsdaleite type Word106286395.
- Lonsdaleite type ChemicalSubstance.
- Lonsdaleite type Mineral.
- Lonsdaleite type ChemicalObject.
- Lonsdaleite type Thing.
- Lonsdaleite comment "Lonsdaleite (named in honour of Kathleen Lonsdale), also called hexagonal diamond in reference to the crystal structure, is an allotrope of carbon with a hexagonal lattice. In nature, it forms when meteorites containing graphite strike the Earth. The great heat and stress of the impact transforms the graphite into diamond, but retains graphite's hexagonal crystal lattice.".
- Lonsdaleite label "Lonsdaleit".
- Lonsdaleite label "Lonsdaleit".
- Lonsdaleite label "Lonsdaleite".
- Lonsdaleite label "Lonsdaleite".
- Lonsdaleite label "Lonsdaleíta".
- Lonsdaleite label "Lonsdaleíta".
- Lonsdaleite label "Lonsdaléite".
- Lonsdaleite label "Лонсдейлит".
- Lonsdaleite label "ロンズデーライト".
- Lonsdaleite label "藍絲黛爾石".
- Lonsdaleite sameAs Lonsdaleit.
- Lonsdaleite sameAs Lonsdaleíta.
- Lonsdaleite sameAs Lonsdaléite.
- Lonsdaleite sameAs Lonsdaleite.
- Lonsdaleite sameAs ロンズデーライト.
- Lonsdaleite sameAs 론스달라이트.
- Lonsdaleite sameAs Lonsdaleit.
- Lonsdaleite sameAs Lonsdaleíta.
- Lonsdaleite sameAs m.04ljn.
- Lonsdaleite sameAs Q411827.
- Lonsdaleite sameAs Q411827.
- Lonsdaleite sameAs Lonsdaleite.
- Lonsdaleite wasDerivedFrom Lonsdaleite?oldid=602127748.
- Lonsdaleite depiction Lonsdaleite.png.
- Lonsdaleite isPrimaryTopicOf Lonsdaleite.
- Lonsdaleite name "Lonsdaleite".