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- Corundum abstract "Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen. The name "corundum" is derived from Tamil word Kuruvindam or Sanskrit word Kuruvinda meaning ruby.Because of corundum's hardness (pure corundum is defined to have 9.0 Mohs), it can scratch almost every other mineral. It is commonly used as an abrasive on everything from sandpaper to large machines used in machining metals, plastics, and wood. Some emery is a mix of corundum and other substances, and the mix is less abrasive, with an average Mohs hardness of 8.0. In addition to its hardness, corundum is unusual for its density of 4.02 g/cm3, which is very high for a transparent mineral composed of the low atomic mass elements aluminium and oxygen.".
- Corundum thumbnail Several_corundum_crystals.jpg?width=300.
- Corundum wikiPageID "5974".
- Corundum wikiPageRevisionID "637830120".
- Corundum alteration "May alter to mica on surfaces causing a decrease in hardness".
- Corundum category "Oxide mineral – Hematite group".
- Corundum cleavage "None – parting in 3 directions".
- Corundum color "Colorless, gray, brown; pink to red, orange, yellow, green, blue, violet; may be color zoned, asteriated mainly grey and brown".
- Corundum dana "4.3".
- Corundum diaphaneity "Transparent, translucent to opaque".
- Corundum formula "Aluminium oxide,".
- Corundum fracture "Conchoidal to uneven".
- Corundum fusibility "Infusible".
- Corundum gravity "3.95".
- Corundum habit "Steep bipyramidal, tabular, prismatic, rhombohedral crystals, massive or granular".
- Corundum hasPhotoCollection Corundum.
- Corundum luster "Adamantine to vitreous".
- Corundum melt "2044.0".
- Corundum mohs "9".
- Corundum name "Corundum".
- Corundum opticalprop "Uniaxial".
- Corundum other "May fluoresce or phosphoresce under UV light".
- Corundum pleochroism "None".
- Corundum refractive "nε = 1.759–1.763".
- Corundum refractive "nω = 1.767–1.772".
- Corundum solubility "Insoluble".
- Corundum streak "White".
- Corundum strunz "4".
- Corundum symmetry "Trigonal".
- Corundum system Trigonal_crystal_system.
- Corundum system "Space group: Rc".
- Corundum system "Symbol".
- Corundum tenacity "Brittle".
- Corundum twinning "Polysynthetic twinning common".
- Corundum unitCell "a = 4.75 Å, c = 12.982 Å; Z=6".
- Corundum var Emery_(rock).
- Corundum var Ruby.
- Corundum var Sapphire.
- Corundum var1text "Any color except red".
- Corundum var2text "Red".
- Corundum var3text "Black granular corundum intimately mixed with magnetite, hematite, or hercynite".
- Corundum wordnet_type synset-mineral-noun-1.
- Corundum subject Category:Abrasives.
- Corundum subject Category:Aluminium_minerals.
- Corundum subject Category:Corundum_varieties.
- Corundum subject Category:Hematite_group.
- Corundum subject Category:Oxide_minerals.
- Corundum subject Category:Polymorphism_(materials_science).
- Corundum subject Category:Superhard_materials.
- Corundum subject Category:Trigonal_minerals.
- Corundum type ChemicalSubstance.
- Corundum type Mineral.
- Corundum type ChemicalObject.
- Corundum type Thing.
- Corundum type Q7946.
- Corundum comment "Corundum is a crystalline form of aluminium oxide (Al2O3) with traces of iron, titanium and chromium. It is a rock-forming mineral. It is one of the naturally transparent materials, but can have different colors when impurities are present. Transparent specimens are used as gems, called ruby if red and padparadscha if pink-orange. All other colors are called sapphire, e.g., "green sapphire" for a green specimen.".
- Corundum label "Corindon".
- Corundum label "Corindone".
- Corundum label "Corindó".
- Corundum label "Corindón".
- Corundum label "Corundum".
- Corundum label "Coríndon".
- Corundum label "Korendon".
- Corundum label "Korindoi".
- Corundum label "Korund".
- Corundum label "Korund".
- Corundum label "Korund".
- Corundum label "Korund".
- Corundum label "Korund".
- Corundum label "Korundum".
- Corundum label "Корунд".
- Corundum label "Корунд".
- Corundum label "コランダム".
- Corundum label "강옥".
- Corundum differentFrom Silicon_carbide.
- Corundum sameAs Korund.
- Corundum sameAs Korund.
- Corundum sameAs Κορούνδιο.
- Corundum sameAs Corindón.
- Corundum sameAs Korindoi.
- Corundum sameAs Corindon.
- Corundum sameAs Korundum.
- Corundum sameAs Corindone.
- Corundum sameAs コランダム.
- Corundum sameAs 강옥.
- Corundum sameAs Korund.
- Corundum sameAs Korund.
- Corundum sameAs Coríndon.
- Corundum sameAs m.01stq.
- Corundum sameAs Q131777.
- Corundum sameAs Q131777.
- Corundum wasDerivedFrom Corundum?oldid=637830120.
- Corundum depiction Several_corundum_crystals.jpg.
- Corundum isPrimaryTopicOf Corundum.
- Corundum name "Corundum".