Matches in DBpedia 2015-10 for { <http://dbpedia.org/resource/Yogo_sapphire> ?p ?o }
- Yogo_sapphire abstract "Yogo sapphires are a variety of corundum found only in Yogo Gulch, part of the Little Belt Mountains in Judith Basin County, Montana, United States, on land once inhabited by the Piegan Blackfeet people. Yogos 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 Yogos are still in the ground. Jewelry containing Yogos was given to First Ladies Florence Harding and Bess Truman; in addition, many gems were sold in Europe, though promoters' claims that Yogos are in the crown jewels of England or the engagement ring of Princess Diana are dubious. Today, several Yogo sapphires are part of the Smithsonian Institution's gem collection.Yogo sapphires were not initially recognized or valued. Gold was discovered at Yogo Creek in 1866, and though "blue pebbles" were noticed alongside gold in the stream alluvium by 1878, it was not until 1894 that the "blue pebbles" were recognized as sapphires. Sapphire mining began in 1895 after a local rancher named Jake Hoover sent a cigar box of gems he had collected to an assay office, which in turn sent them to Tiffany's in New York, where an appraiser pronounced them "the finest precious gemstones ever found in the United States". Hoover then purchased the original mother lode from a sheepherder, later selling it to other investors. This became the highly profitable "English Mine", which flourished from 1899 until the 1920s. A second operation, the "American Mine", was owned by a series of investors in the western section of the Yogo dike, but was less profitable and bought out by the syndicate that owned the English Mine. In 1984, a third set of claims, known as the Vortex mine, opened.The term "Yogo sapphire" is the preferred wording for gems found in the Yogo Gulch, whereas "Montana sapphire" generally refers to gems found in other Montana locations. More gem-quality sapphires are produced in Montana than anywhere else in North America. Sapphires were first discovered in Montana in 1865, in alluvium along the Missouri River. Finds in other locations in the western half of the state occurred in 1889, 1892, and 1894. The Rock Creek location, near Phillipsburg, is the most productive site in Montana, and its gems inspired the name of the nearby Sapphire Mountains. In 1969, the sapphire was co-designated along with the agate as Montana's state gemstones.In the early 1980s, Intergem Limited, which controlled most of the Yogo sapphire mining at the time, rocked the gem world by marketing Yogos as the world's only guaranteed "untreated" sapphire, exposing a practice of the time wherein 95 percent of all the world's sapphires were heat-treated to enhance their natural color. Although Intergem went out of business, the gems it mined appeared on the market through the 1990s because the company had paid its salesmen in sapphires during its financial demise. Citibank had obtained a large stock of Yogos as a result of Intergem's collapse, and after keeping them in a vault for nearly a decade, sold its collection in 1994 to a Montana jeweler. Mining activity today is largely confined to hobby miners in the area; the major mines are currently inactive.".
- Yogo_sapphire thumbnail Yogo2783_Close_crop.JPG?width=300.
- Yogo_sapphire wikiPageExternalLink books?id=iisAAAAAMAAJ&pg=PA483.
- Yogo_sapphire wikiPageExternalLink yogo.html.
- Yogo_sapphire wikiPageID "33521256".
- Yogo_sapphire wikiPageLength "66459".
- Yogo_sapphire wikiPageOutDegree "181".
- Yogo_sapphire wikiPageRevisionID "671368331".
- Yogo_sapphire wikiPageWikiLink AWOL.
- Yogo_sapphire wikiPageWikiLink Abbe_number.
- Yogo_sapphire wikiPageWikiLink Agate.
- Yogo_sapphire wikiPageWikiLink Alaska.
- Yogo_sapphire wikiPageWikiLink Albuquerque,_New_Mexico.
- Yogo_sapphire wikiPageWikiLink Alluvium.
- Yogo_sapphire wikiPageWikiLink Aluminium_oxide.
- Yogo_sapphire wikiPageWikiLink Amateur_geology.
- Yogo_sapphire wikiPageWikiLink Argon–argon_dating.
- Yogo_sapphire wikiPageWikiLink Bedrock.
- Yogo_sapphire wikiPageWikiLink Belt_Supergroup.
- Yogo_sapphire wikiPageWikiLink Berkhamsted.
- Yogo_sapphire wikiPageWikiLink Bess_Truman.
- Yogo_sapphire wikiPageWikiLink Big_Snowy_Group.
- Yogo_sapphire wikiPageWikiLink Billings,_Montana.
- Yogo_sapphire wikiPageWikiLink Bipyramid.
- Yogo_sapphire wikiPageWikiLink Birefringence.
- Yogo_sapphire wikiPageWikiLink Bismarck_Sapphire_Necklace.
- Yogo_sapphire wikiPageWikiLink Blackfoot_language.
- Yogo_sapphire wikiPageWikiLink Bozeman,_Montana.
- Yogo_sapphire wikiPageWikiLink Breccia.
- Yogo_sapphire wikiPageWikiLink Butte,_Montana.
- Yogo_sapphire wikiPageWikiLink Cabochon.
- Yogo_sapphire wikiPageWikiLink Carat_(purity).
- Yogo_sapphire wikiPageWikiLink Cascade_County,_Montana.
- Yogo_sapphire wikiPageWikiLink Category:Aluminium_minerals.
- Yogo_sapphire wikiPageWikiLink Category:Corundum_varieties.
- Yogo_sapphire wikiPageWikiLink Category:Dielectrics.
- Yogo_sapphire wikiPageWikiLink Category:Gemstones.
- Yogo_sapphire wikiPageWikiLink Category:Geology_of_Montana.
- Yogo_sapphire wikiPageWikiLink Category:Optical_materials.
- Yogo_sapphire wikiPageWikiLink Category:Oxide_minerals.
- Yogo_sapphire wikiPageWikiLink Category:Superhard_materials.
- Yogo_sapphire wikiPageWikiLink Category:Transparent_materials.
- Yogo_sapphire wikiPageWikiLink Category:Trigonal_minerals.
- Yogo_sapphire wikiPageWikiLink Catherine,_Duchess_of_Cambridge.
- Yogo_sapphire wikiPageWikiLink Charles_Marion_Russell.
- Yogo_sapphire wikiPageWikiLink Chemical_equilibrium.
- Yogo_sapphire wikiPageWikiLink Chromium.
- Yogo_sapphire wikiPageWikiLink Citibank.
- Yogo_sapphire wikiPageWikiLink Clastic.
- Yogo_sapphire wikiPageWikiLink Clastic_rock.
- Yogo_sapphire wikiPageWikiLink Conchoidal_fracture.
- Yogo_sapphire wikiPageWikiLink Cornflower_blue.
- Yogo_sapphire wikiPageWikiLink Corundum.
- Yogo_sapphire wikiPageWikiLink Crown_jewels.
- Yogo_sapphire wikiPageWikiLink Desertion.
- Yogo_sapphire wikiPageWikiLink Diana,_Princess_of_Wales.
- Yogo_sapphire wikiPageWikiLink Dike_(geology).
- Yogo_sapphire wikiPageWikiLink Dry_Cottonwood_Creek_(Deer_Lodge_County,_Montana).
- Yogo_sapphire wikiPageWikiLink En_echelon_veins.
- Yogo_sapphire wikiPageWikiLink Erosion_surface.
- Yogo_sapphire wikiPageWikiLink Exposition_Universelle_(1900).
- Yogo_sapphire wikiPageWikiLink Fault_(geology).
- Yogo_sapphire wikiPageWikiLink Fergus_County,_Montana.
- Yogo_sapphire wikiPageWikiLink Fineness.
- Yogo_sapphire wikiPageWikiLink First_Lady_of_the_United_States.
- Yogo_sapphire wikiPageWikiLink Florence_Harding.
- Yogo_sapphire wikiPageWikiLink Fort_Benton,_Montana.
- Yogo_sapphire wikiPageWikiLink Garnet.
- Yogo_sapphire wikiPageWikiLink Garnet_Range.
- Yogo_sapphire wikiPageWikiLink Gemcutter.
- Yogo_sapphire wikiPageWikiLink Gemstone.
- Yogo_sapphire wikiPageWikiLink Geological_engineer.
- Yogo_sapphire wikiPageWikiLink Geological_resistance.
- Yogo_sapphire wikiPageWikiLink Geophysics.
- Yogo_sapphire wikiPageWikiLink Geoprofessions.
- Yogo_sapphire wikiPageWikiLink George_Frederick_Kunz.
- Yogo_sapphire wikiPageWikiLink Geuda.
- Yogo_sapphire wikiPageWikiLink Gneiss.
- Yogo_sapphire wikiPageWikiLink Gold_Rush.
- Yogo_sapphire wikiPageWikiLink Gold_mining.
- Yogo_sapphire wikiPageWikiLink Gold_rush.
- Yogo_sapphire wikiPageWikiLink Great_Falls,_Montana.
- Yogo_sapphire wikiPageWikiLink Hall_Sapphire_and_Diamond_Necklace.
- Yogo_sapphire wikiPageWikiLink Harry_S._Truman.
- Yogo_sapphire wikiPageWikiLink Harry_Truman.
- Yogo_sapphire wikiPageWikiLink Helena,_Montana.
- Yogo_sapphire wikiPageWikiLink Hertfordshire.
- Yogo_sapphire wikiPageWikiLink Hexagonal_crystal_system.
- Yogo_sapphire wikiPageWikiLink Igneous.
- Yogo_sapphire wikiPageWikiLink Igneous_rock.
- Yogo_sapphire wikiPageWikiLink Inclusion_(mineral).
- Yogo_sapphire wikiPageWikiLink Indigenous_peoples_of_the_Americas.
- Yogo_sapphire wikiPageWikiLink Intrusion.
- Yogo_sapphire wikiPageWikiLink Intrusive.
- Yogo_sapphire wikiPageWikiLink Iron.
- Yogo_sapphire wikiPageWikiLink Isaac_Lea.
- Yogo_sapphire wikiPageWikiLink Jade.
- Yogo_sapphire wikiPageWikiLink Judith_Basin_County,_Montana.
- Yogo_sapphire wikiPageWikiLink Judith_River.
- Yogo_sapphire wikiPageWikiLink Karst.