Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Opal> ?p ?o. }
Showing items 1 to 75 of
75
with 100 items per page.
- Opal abstract "Opal is a hydrated amorphous form of silica; its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Because of its amorphous character it is classed as a mineraloid, unlike the other crystalline forms of silica which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl and basalt. Opal is the national gemstone of Australia, which produces 97% of the world's supply. This includes the production of the state of South Australia, which accounts for approximately 80% of the world's supply.The internal structure of precious opal makes it diffract light; depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the reds against black are the most rare, whereas white and greens are the most common. It varies in optical density from opaque to semi-transparent.Common opal, called "potch" by miners, does not show the display of color exhibited in precious opal.".
- Opal thumbnail Coober_Pedy_opal_at_the_SAM_1.JPG?width=300.
- Opal wikiPageExternalLink opal.html.
- Opal wikiPageExternalLink opal.
- Opal wikiPageExternalLink fossils.
- Opal wikiPageID "54513".
- Opal wikiPageRevisionID "606668423".
- Opal absorption "green stones: 660nm, 470nm cutoff".
- Opal birefringence "none".
- Opal caption "Precious opal replacing calcite of bivalve shells, from Coober Pedy; display specimen, South Australian Museum".
- Opal category Mineraloid.
- Opal cleavage "None".
- Opal color "Colorless, white, yellow, red, orange, green, brown, black, blue".
- Opal density "2.09".
- Opal diagnostic "darkening upon heating".
- Opal diaphaneity "opaque, translucent, transparent".
- Opal fluorescence "black or white body color: inert to white to moderate light blue, green, or yellow in long and short wave. May also phosphoresce; common opal: inert to strong green or yellowish green in long and short wave, may phosphoresce; fire opal: inert to moderate greenish brown in long and short wave, may phosphoresce.".
- Opal formula "Hydrated silica. SiO2·nH2O".
- Opal fracture "Conchoidal to uneven".
- Opal gravity "2.15".
- Opal habit "Irregular veins, in masses, in nodules".
- Opal hasPhotoCollection Opal.
- Opal luster "Subvitreous to waxy".
- Opal mohs "5.5".
- Opal name "Opal".
- Opal opticalprop "Single refractive, often anomalous double refractive due to strain".
- Opal pleochroism "None".
- Opal polish "Vitreous to resinous".
- Opal refractive "1.45".
- Opal solubility "hot saltwater, bases, methanol, humic acid, hydrofluoric acid".
- Opal streak "White".
- Opal system "Amorphous".
- Opal wordnet_type synset-mineral-noun-1.
- Opal subject Category:Emblems_of_South_Australia.
- Opal subject Category:Gemstones.
- Opal subject Category:Glass_in_nature.
- Opal subject Category:Hydrates.
- Opal subject Category:National_symbols_of_Australia.
- Opal subject Category:Quartz_varieties.
- Opal type ChemicalSubstance.
- Opal type Mineral.
- Opal type ChemicalObject.
- Opal type Thing.
- Opal comment "Opal is a hydrated amorphous form of silica; its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Because of its amorphous character it is classed as a mineraloid, unlike the other crystalline forms of silica which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl and basalt.".
- Opal label "Opaal".
- Opal label "Opal".
- Opal label "Opal".
- Opal label "Opal".
- Opal label "Opala".
- Opal label "Opale".
- Opal label "Opale".
- Opal label "Ópalo".
- Opal label "Опал".
- Opal label "أوبال".
- Opal label "オパール".
- Opal label "蛋白石".
- Opal sameAs Opál.
- Opal sameAs Opal.
- Opal sameAs Ópalo.
- Opal sameAs Opalo.
- Opal sameAs Opale.
- Opal sameAs Opal.
- Opal sameAs Opale.
- Opal sameAs オパール.
- Opal sameAs 단백석.
- Opal sameAs Opaal.
- Opal sameAs Opal.
- Opal sameAs Opala.
- Opal sameAs m.0f7cb.
- Opal sameAs Q171058.
- Opal sameAs Q171058.
- Opal wasDerivedFrom Opal?oldid=606668423.
- Opal depiction Coober_Pedy_opal_at_the_SAM_1.JPG.
- Opal isPrimaryTopicOf Opal.
- Opal name "Opal".
