Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Lonsdaleite> ?p ?o }
- 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 1,000 °C (1,832 °F).It is translucent, brownish-yellow, 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). The cause is speculated as being due to the samples having been ridden with lattice defects and impurities.The existence of lonsdaleite as a discrete material has been questioned, as evidence suggests that what has been interpreted as lonsdaleite is instead cubic diamond dominated by structural defects. A quantitative analysis of the X-ray diffraction data of lonsdaleite has shown that about equal amounts of hexagonal and cubic stacking sequences are present. Consequently, it has been suggested that "stacking disordered diamond" is the most accurate structural description of lonsdaleite.".
- 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 wikiPageLength "12360".
- Lonsdaleite wikiPageOutDegree "50".
- Lonsdaleite wikiPageRevisionID "682439500".
- Lonsdaleite wikiPageWikiLink Aggregated_diamond_nanorod.
- Lonsdaleite wikiPageWikiLink Allan_Hills_77283.
- Lonsdaleite wikiPageWikiLink Allotrope_of_carbon.
- Lonsdaleite wikiPageWikiLink Allotropes_of_carbon.
- Lonsdaleite wikiPageWikiLink Boat_conformation.
- Lonsdaleite wikiPageWikiLink Canyon_Diablo_(meteorite).
- Lonsdaleite wikiPageWikiLink Canyon_Diablo_meteorite.
- Lonsdaleite wikiPageWikiLink Category:Carbon_forms.
- Lonsdaleite wikiPageWikiLink Category:Meteorite_minerals.
- Lonsdaleite wikiPageWikiLink Category:Native_element_minerals.
- Lonsdaleite wikiPageWikiLink Category:Superhard_materials.
- Lonsdaleite wikiPageWikiLink Chair_conformation.
- Lonsdaleite wikiPageWikiLink Chemical_synthesis.
- Lonsdaleite wikiPageWikiLink Chemical_vapor_deposition.
- Lonsdaleite wikiPageWikiLink Close-packing.
- Lonsdaleite wikiPageWikiLink Close-packing_of_equal_spheres.
- Lonsdaleite wikiPageWikiLink Crystal_lattice.
- Lonsdaleite wikiPageWikiLink Crystal_structure.
- Lonsdaleite wikiPageWikiLink Crystal_system.
- Lonsdaleite wikiPageWikiLink Cyclohexane_conformation.
- Lonsdaleite wikiPageWikiLink Diamond.
- Lonsdaleite wikiPageWikiLink Diamond_type.
- Lonsdaleite wikiPageWikiLink Eclipsed_conformation.
- Lonsdaleite wikiPageWikiLink GPa.
- Lonsdaleite wikiPageWikiLink Glossary_of_meteoritics.
- Lonsdaleite wikiPageWikiLink Graphite.
- Lonsdaleite wikiPageWikiLink Guanajuato.
- Lonsdaleite wikiPageWikiLink H-M_symbol.
- Lonsdaleite wikiPageWikiLink Hardness.
- Lonsdaleite wikiPageWikiLink Hermann–Mauguin_notation.
- Lonsdaleite wikiPageWikiLink Hexagonal_crystal_system.
- Lonsdaleite wikiPageWikiLink Kathleen_Lonsdale.
- Lonsdaleite wikiPageWikiLink Kenna_meteorite.
- Lonsdaleite wikiPageWikiLink Lake_Cuitzeo.
- Lonsdaleite wikiPageWikiLink List_of_minerals.
- Lonsdaleite wikiPageWikiLink List_of_minerals_named_after_people.
- Lonsdaleite wikiPageWikiLink Material_properties_of_diamond.
- Lonsdaleite wikiPageWikiLink Meteor.
- Lonsdaleite wikiPageWikiLink Meteoroid.
- Lonsdaleite wikiPageWikiLink Miller_index.
- Lonsdaleite wikiPageWikiLink Mohs_hardness_scale.
- Lonsdaleite wikiPageWikiLink Mohs_scale_of_mineral_hardness.
- Lonsdaleite wikiPageWikiLink Pascal_(unit).
- Lonsdaleite wikiPageWikiLink Placer_deposit.
- Lonsdaleite wikiPageWikiLink Poly(hydridocarbyne).
- Lonsdaleite wikiPageWikiLink Refractive_index.
- Lonsdaleite wikiPageWikiLink Sakha_Republic.
- Lonsdaleite wikiPageWikiLink Space_group.
- Lonsdaleite wikiPageWikiLink Specific_gravity.
- Lonsdaleite wikiPageWikiLink Staggered_conformation.
- Lonsdaleite wikiPageWikiLink Tunguska_event.
- Lonsdaleite wikiPageWikiLink Unit_cell.
- Lonsdaleite wikiPageWikiLink X-ray_crystallography.
- Lonsdaleite wikiPageWikiLink X-ray_diffraction.
- Lonsdaleite wikiPageWikiLink Younger_Dryas.
- Lonsdaleite wikiPageWikiLinkText "Lonsdaleite".
- Lonsdaleite wikiPageWikiLinkText "hexagonal diamonds".
- Lonsdaleite wikiPageWikiLinkText "lonsdaleite".
- 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 H-M_symbol.
- Lonsdaleite symmetry Hermann–Mauguin_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 wikiPageUsesTemplate Template:Allotropes_of_carbon.
- Lonsdaleite wikiPageUsesTemplate Template:Cite_book.
- Lonsdaleite wikiPageUsesTemplate Template:Convert.
- Lonsdaleite wikiPageUsesTemplate Template:Infobox_mineral.
- Lonsdaleite wikiPageUsesTemplate Template:Meteorites.
- Lonsdaleite wikiPageUsesTemplate Template:Reflist.
- Lonsdaleite subject Category:Carbon_forms.
- Lonsdaleite subject Category:Meteorite_minerals.
- Lonsdaleite subject Category:Native_element_minerals.
- Lonsdaleite subject Category:Superhard_materials.
- Lonsdaleite hypernym Allotrope.
- Lonsdaleite type Article.