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About: Yogo sapphire     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:WikicatDielectrics, within Data Space : dbpedia.org associated with source document(s)

Type: Thingdul:ChemicalObjectchemical substanceMineralgrapemineralyago:WikicatCorundumVarietiesyago:WikicatTransparentMaterialsyago:WikicatTrigonalMineralsgeo:SpatialThingyago:WikicatOpticalMaterialsyago:WikicatOxideMineralsyago:WikicatSuperhardMaterialsyago:Abstraction100002137yago:Assortment108398773yago:Collection107951464yago:Group100031264yago:Insulator114821590yago:Material114580897yago:Matter100020827yago:Mineral114662574yago:Part113809207yago:PhysicalEntity100001930yago:Relation100031921yago:Substance100019613yago:WikicatAluminiumMineralsyago:WikicatDielectrics New Facet based on Instances of this Class

Yogo sapphires are blue sapphires, a colored variety of corundum, found in Montana, primarily in Yogo Gulch (part of the Little Belt Mountains) in Judith Basin County, Montana. Yogo sapphires are typically cornflower blue, a result of trace amounts of iron and titanium. They have high uniform clarity and maintain their brilliance under artificial light. Because Yogo sapphires occur within a vertically dipping resistive igneous dike, mining efforts have been sporadic and rarely profitable. It is estimated that at least 28 million carats (5.6 t or 5.5 long tons or 6.2 short tons) of Yogo sapphires are still in the ground. Jewelry containing Yogo sapphires was given to First Ladies Florence Harding and Bess Truman; in addition, many gems were sold in Europe, though promoters' claims that Yogo