Matches in DBpedia 2014 for { <http://dbpedia.org/resource/Robertsite> ?p ?o. }
Showing items 1 to 62 of
62
with 100 items per page.
- Robertsite abstract "Robertsite, Ca3(Mn3+)4[(OH)3| (PO4)2]2·3(H2O) (alternatively formulated Ca2(Mn3(PO4)3O2)(H2O)3), is a secondary phosphate mineral named for Willard Lincoln Roberts (1923–1987), mineralogist and professor at South Dakota School of Mines in Rapid City, South Dakota. The type locality for Robertsite is the Tip Top mine, Custer County, South Dakota, USA. Robertsite occurs at the Tip Top Mine as minute crystal aggregates and crusts found on quartz associated with triphylite. It is a dark reddish brown to black monoclinic mineral.It occurs as a secondary mineral in pegmatite. It is also reported from the Khoa Rang Kai phosphate deposit, Chiang Mai, Thailand in a limestone guano deposit. It is associated with rockbridgeite, ferrisicklerite, leucophosphite, jahnsite, montgomeryite, collinsite and hureaulite in the type locality. In the guano deposit it occurs with carbonate-fluorapatite, calcite, dolomite, quartz and clay minerals. In the Omo Valley of Ethiopia it occurs with mitridatite associated with fossil fish in Pliocene/Pleistocene lake sediments.Recently, in an exploration conducted by the Italian La Venta Geographical Association, confirmed the existence of Robertsite in the Puerto Princesa Subterranean River National Park, located about 50 kilometres (31 mi) north of the city center of Puerto Princesa, Palawan, Philippines.Mitridatite group:Arseniosiderite-mitridatite series:Ca2(Fe3+)3[(O)2|(AsO4)3]·3H2OtoCa2(Fe3+)3[(O)2|(PO4)3]·3H2OArseniosiderite-robertsite series:Ca2(Fe3+)3[(O)2|(AsO4)3]·3H2OtoCa3(Mn3+)4[(OH)3|(PO4)2]2·3H2O↑ ↑ 2.0 2.1 2.2 ↑ ↑ ↑ ↑ ↑ ↑".
- Robertsite thumbnail Robertsite-Beraunite-220952.jpg?width=300.
- Robertsite wikiPageExternalLink 141.
- Robertsite wikiPageID "6900992".
- Robertsite wikiPageRevisionID "577484536".
- Robertsite 2v "Measured: 8°".
- Robertsite birefringence "δ = 0.045".
- Robertsite caption "Robertsite spheres on beraunite".
- Robertsite category Phosphate_minerals.
- Robertsite cleavage "Very good {100}".
- Robertsite color "Red, red-brown, deep red, bronzy brown, black".
- Robertsite dana "42.08".
- Robertsite diaphaneity "Translucent".
- Robertsite formula "Ca34[3| 2]2·3H2O".
- Robertsite fracture "Micaceous".
- Robertsite gravity "3.13".
- Robertsite habit "laty to wedge-shaped, pseudorhombohedral crystals; fibrous, in botryoidal to feathery aggregates".
- Robertsite hasPhotoCollection Robertsite.
- Robertsite luster "Vitreous to resinous or waxy".
- Robertsite mohs "3".
- Robertsite name "Robertsite".
- Robertsite opticalprop "Biaxial".
- Robertsite pleochroism "Strong, X pale red to pink Y,Z deep red brown".
- Robertsite refractive "nα = 1.775 nβ = 1.820 nγ = 1.820".
- Robertsite streak "Chocolate-brown".
- Robertsite strunz "8".
- Robertsite symmetry "Monoclinic 2/m prismatic".
- Robertsite system Monoclinic_crystal_system.
- Robertsite twinning "Common perpendicular to {100}".
- Robertsite unitCell "a = 17.36 Å, b = 19.53 Å, c = 11.30 Å; β = 96.0°; Z = 12".
- Robertsite subject Category:Manganese_minerals.
- Robertsite subject Category:Monoclinic_minerals.
- Robertsite subject Category:Phosphate_minerals.
- Robertsite type Abstraction100002137.
- Robertsite type ManganeseMinerals.
- Robertsite type Material114580897.
- Robertsite type Matter100020827.
- Robertsite type Mineral114662574.
- Robertsite type MonoclinicMinerals.
- Robertsite type Part113809207.
- Robertsite type PhosphateMinerals.
- Robertsite type PhysicalEntity100001930.
- Robertsite type Relation100031921.
- Robertsite type Substance100019613.
- Robertsite type ChemicalSubstance.
- Robertsite type Mineral.
- Robertsite type ChemicalObject.
- Robertsite type Thing.
- Robertsite comment "Robertsite, Ca3(Mn3+)4[(OH)3| (PO4)2]2·3(H2O) (alternatively formulated Ca2(Mn3(PO4)3O2)(H2O)3), is a secondary phosphate mineral named for Willard Lincoln Roberts (1923–1987), mineralogist and professor at South Dakota School of Mines in Rapid City, South Dakota. The type locality for Robertsite is the Tip Top mine, Custer County, South Dakota, USA. Robertsite occurs at the Tip Top Mine as minute crystal aggregates and crusts found on quartz associated with triphylite.".
- Robertsite label "Robertsita".
- Robertsite label "Robertsite".
- Robertsite label "Robertsite".
- Robertsite sameAs Robertsita.
- Robertsite sameAs Robertsite.
- Robertsite sameAs m.0gw6z5.
- Robertsite sameAs Q2917459.
- Robertsite sameAs Q2917459.
- Robertsite sameAs Robertsite.
- Robertsite wasDerivedFrom Robertsite?oldid=577484536.
- Robertsite depiction Robertsite-Beraunite-220952.jpg.
- Robertsite isPrimaryTopicOf Robertsite.
- Robertsite name "Robertsite".
