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- La robertsita és un mineral de la classe dels fosfats que pertany al grup mitridatita. Va ser descoberta el 1974 en una mina del comtat de Custer, a l'estat de Dakota del Sud (Estats Units), sent nomenada així en honor de Willard Lincoln Roberts (1923-1987), mineralogista nord-americà. (ca)
- La robertsita es un mineral de la clase de los minerales fosfatos. Fue descubierta en 1974 en una mina del condado de Custer, en el estado de Dakota del Sur (EE. UU.), siendo nombrada así en honor de Willard L. Roberts, mineralogista estadounidense. Un sinónimo es su clave: IMA1973-024. (es)
- Robertsita fosfato motako minerala da eta mitridatita taldearen kidea da. (eu)
- 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 (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, US. 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, , leucophosphite, , 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 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]·3H2O
* to
* Ca2(Fe3+)3[(O)2|(PO4)3]·3H2O
* Arseniosiderite-robertsite series:
* Ca2(Fe3+)3[(O)2|(AsO4)3]·3H2O
* to
* Ca3(Mn3+)4[(OH)3|(PO4)2]2·3H2O (en)
- La robertsite è un minerale appartenente al gruppo dell'arseniosiderite. (it)
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- 6825 (xsd:nonNegativeInteger)
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- Robertsite spheres on beraunite (en)
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- Red, red-brown, deep red, bronzy brown, black (en)
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- 42.080000 (xsd:double)
- Mitridatite group (en)
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- laty to wedge-shaped, pseudorhombohedral crystals; fibrous, in botryoidal to feathery aggregates (en)
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- Vitreous to resinous or waxy (en)
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| dbp:pleochroism
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- Strong, X pale red to pink Y,Z deep red brown (en)
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- nα = 1.775 nβ = 1.820 nγ = 1.820 (en)
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- Common perpendicular to {100} (en)
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- a = 17.36 Å, b = 19.53 Å (en)
- c = 11.30 Å; β = 96.0°; Z = 12 (en)
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- La robertsita és un mineral de la classe dels fosfats que pertany al grup mitridatita. Va ser descoberta el 1974 en una mina del comtat de Custer, a l'estat de Dakota del Sud (Estats Units), sent nomenada així en honor de Willard Lincoln Roberts (1923-1987), mineralogista nord-americà. (ca)
- La robertsita es un mineral de la clase de los minerales fosfatos. Fue descubierta en 1974 en una mina del condado de Custer, en el estado de Dakota del Sur (EE. UU.), siendo nombrada así en honor de Willard L. Roberts, mineralogista estadounidense. Un sinónimo es su clave: IMA1973-024. (es)
- Robertsita fosfato motako minerala da eta mitridatita taldearen kidea da. (eu)
- La robertsite è un minerale appartenente al gruppo dell'arseniosiderite. (it)
- 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 (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, US. 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. (en)
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| rdfs:label
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- Robertsita (ca)
- Robertsita (es)
- Robertsita (eu)
- Robertsite (it)
- Robertsite (en)
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