Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Leucite> ?p ?o }
- Leucite abstract "Leucite is a rock-forming mineral composed of potassium and aluminium tectosilicate K[AlSi2O6]. Crystals have the form of cubic icositetrahedra but, as first observed by Sir David Brewster in 1821, they are not optically isotropic, and are therefore pseudo-cubic. Goniometric measurements made by Gerhard vom Rath in 1873 led him to refer the crystals to the tetragonal system. Optical investigations have since proved the crystals to be still more complex in character, and to consist of several orthorhombic or monoclinic individuals, which are optically biaxial and repeatedly twinned, giving rise to twin-lamellae and to striations on the faces. When the crystals are raised to a temperature of about 500 °C they become optically isotropic and the twin-lamellae and striations disappear, although they reappear when the crystals are cooled again. This pseudo-cubic character of leucite is very similar to that of the mineral boracite.The crystals are white or ash-grey in colour, hence the name suggested by A. G. Werner in 1701, from λευκος, '(matt) white'. They are transparent and glassy when fresh, albeit with a noticeably subdued 'subvitreous' lustre due to the low refractive index, but readily alter to become waxy/greasy and then dull and opaque; they are brittle and break with a conchoidal fracture. The Mohs hardness is 5.5, and the specific gravity 2.47. Inclusions of other minerals, arranged in concentric zones, are frequently present in the crystals. On account of the color and form of the crystals the mineral was early known as 'white garnet'. French authors in older literature may employ René Just Haüy's name amphigène, but 'leucite' is the only name for this mineral species that is recognised as official by the International Mineralogical Association.".
- Leucite thumbnail Leucite_in_rock_w-_nepheline_Potassium_aluminum_silicate_Albano_Hills_Italy_1927.jpg?width=300.
- Leucite wikiPageID "594004".
- Leucite wikiPageLength "12676".
- Leucite wikiPageOutDegree "105".
- Leucite wikiPageRevisionID "635125478".
- Leucite wikiPageWikiLink A._G._Werner.
- Leucite wikiPageWikiLink Abraham_Gottlob_Werner.
- Leucite wikiPageWikiLink Aegirine.
- Leucite wikiPageWikiLink Aluminium.
- Leucite wikiPageWikiLink Analcime.
- Leucite wikiPageWikiLink Analcite.
- Leucite wikiPageWikiLink Anatolia.
- Leucite wikiPageWikiLink Andradite.
- Leucite wikiPageWikiLink Apatite.
- Leucite wikiPageWikiLink Arfvedsonite.
- Leucite wikiPageWikiLink Arkansas.
- Leucite wikiPageWikiLink Asia_Minor.
- Leucite wikiPageWikiLink Augite.
- Leucite wikiPageWikiLink Basalt.
- Leucite wikiPageWikiLink Biotite.
- Leucite wikiPageWikiLink Bohemia.
- Leucite wikiPageWikiLink Boracite.
- Leucite wikiPageWikiLink Borolanite.
- Leucite wikiPageWikiLink Brazil.
- Leucite wikiPageWikiLink Carboniferous.
- Leucite wikiPageWikiLink Category:Aluminium_minerals.
- Leucite wikiPageWikiLink Category:Feldspathoid.
- Leucite wikiPageWikiLink Category:Potassium_minerals.
- Leucite wikiPageWikiLink Category:Tetragonal_minerals.
- Leucite wikiPageWikiLink Crystal.
- Leucite wikiPageWikiLink Crystal_twinning.
- Leucite wikiPageWikiLink Czechoslovakia.
- Leucite wikiPageWikiLink David_Brewster.
- Leucite wikiPageWikiLink Dike_(geology).
- Leucite wikiPageWikiLink Diopside.
- Leucite wikiPageWikiLink England.
- Leucite wikiPageWikiLink Feldspar.
- Leucite wikiPageWikiLink Feldspathoid.
- Leucite wikiPageWikiLink Garnet.
- Leucite wikiPageWikiLink Gerhard_vom_Rath.
- Leucite wikiPageWikiLink Goniometer.
- Leucite wikiPageWikiLink Greenland.
- Leucite wikiPageWikiLink Highwood_Mountains.
- Leucite wikiPageWikiLink Hornblende.
- Leucite wikiPageWikiLink Igneous_rock.
- Leucite wikiPageWikiLink Intrusion.
- Leucite wikiPageWikiLink Intrusive.
- Leucite wikiPageWikiLink Italy.
- Leucite wikiPageWikiLink Java.
- Leucite wikiPageWikiLink Java_(island).
- Leucite wikiPageWikiLink Kola_Peninsula.
- Leucite wikiPageWikiLink Labradorite.
- Leucite wikiPageWikiLink Lamprophyre.
- Leucite wikiPageWikiLink Lava.
- Leucite wikiPageWikiLink Mafic.
- Leucite wikiPageWikiLink Melanite.
- Leucite wikiPageWikiLink Melilite.
- Leucite wikiPageWikiLink Mineral.
- Leucite wikiPageWikiLink Missourite.
- Leucite wikiPageWikiLink Mohs_hardness.
- Leucite wikiPageWikiLink Mohs_scale_of_mineral_hardness.
- Leucite wikiPageWikiLink Monchiquite.
- Leucite wikiPageWikiLink Monoclinic.
- Leucite wikiPageWikiLink Monoclinic_crystal_system.
- Leucite wikiPageWikiLink Montana.
- Leucite wikiPageWikiLink Mount_Kilimanjaro.
- Leucite wikiPageWikiLink Mount_Vesuvius.
- Leucite wikiPageWikiLink Naples.
- Leucite wikiPageWikiLink Nepheline.
- Leucite wikiPageWikiLink New_South_Wales.
- Leucite wikiPageWikiLink Nosean.
- Leucite wikiPageWikiLink Olivine.
- Leucite wikiPageWikiLink Orthoclase.
- Leucite wikiPageWikiLink Orthorhombic.
- Leucite wikiPageWikiLink Orthorhombic_crystal_system.
- Leucite wikiPageWikiLink Perovskite.
- Leucite wikiPageWikiLink Phlegraean_Fields.
- Leucite wikiPageWikiLink Phonolite.
- Leucite wikiPageWikiLink Potassium.
- Leucite wikiPageWikiLink Pseudomorph.
- Leucite wikiPageWikiLink Quartz.
- Leucite wikiPageWikiLink René_Just_Haüy.
- Leucite wikiPageWikiLink Rio_de_Janeiro.
- Leucite wikiPageWikiLink Rock_(geology).
- Leucite wikiPageWikiLink Rome.
- Leucite wikiPageWikiLink Russia.
- Leucite wikiPageWikiLink Scotland.
- Leucite wikiPageWikiLink Silicate_minerals.
- Leucite wikiPageWikiLink Sodalite.
- Leucite wikiPageWikiLink Sodium.
- Leucite wikiPageWikiLink Specific_gravity.
- Leucite wikiPageWikiLink Sphene.
- Leucite wikiPageWikiLink Sulawesi.
- Leucite wikiPageWikiLink Syenite.
- Leucite wikiPageWikiLink Tertiary.
- Leucite wikiPageWikiLink Tetragonal.
- Leucite wikiPageWikiLink Tetragonal_crystal_system.
- Leucite wikiPageWikiLink Tinguaite.
- Leucite wikiPageWikiLink Titanite.