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Thaumasite is a calcium silicate mineral, containing Si atoms in unusual octahedral configuration, with chemical formula Ca3Si(OH)6(CO3)(SO4)·12H2O, also sometimes more simply written as CaSiO3·CaCO3·CaSO4·15H2O. It occurs as colorless to white prismatic hexagonal crystals, typically as acicular radiating groups. It also occurs as fibrous masses. Its Mohs hardness is 3.5 and it has a specific gravity of 1.88 to 1.90. Optically it is uniaxial negative with indices of refraction of nω = 1.507 and nε = 1.468.

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rdf:type
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  • Thaumasita (ca)
  • Thaumasit (de)
  • Taumasita (es)
  • Thaumasita (eu)
  • Thaumasite (fr)
  • Thaumasite (it)
  • Thaumasite (en)
rdfs:comment
  • La thaumasita és un mineral de la classe dels sulfats que rep el nom del grec thaumasio, que vol dir 'sorprenent'. Segons la classificació de Nickel-Strunz, la thaumasita pertany al "07.D - Sulfats (selenats, etc.) amb anions addicionals, amb H₂O, amb cations de mida mitjana i grans; amb NO₃, CO₃, B(OH)₄, SiO₄ o IO₃" juntament amb els següents minerals: darapskita, clinoungemachita, humberstonita, ungemachita, bentorita, charlesita, ettringita, jouravskita, sturmanita, carraraïta, buryatita, rapidcreekita, korkinoïta, tatarskita, nakauriïta, chessexita, carlosruizita, fuenzalidaïta i txeliabinskita. (ca)
  • La taumasita es un mineral de la clase de los minerales sulfatos, y dentro de esta pertenece al llamado “grupo de la etringita”. Fue descubierta en 1878 en Åre, en la provincia de Jämtland (Suecia),​ siendo nombrada así del griego thaumazein -ser sorprendido-, en alusión a su sorprendente composición química con tres aniones distintos. (es)
  • Thaumasita sulfato motako minerala da eta ettringita taldearen kidea da. (eu)
  • La thaumasite è un minerale del gruppo dell'ettringite scoperto nel 1878. Il nome deriva dalla parola greca θαυμάζειν (thaumazein) che significa "essere sorpreso" per via della sua composizione chimica inusuale comprendente anioni carbonati, solfati ed esaidrosilicati. (it)
  • Thaumasit ist ein eher selten vorkommendes Mineral aus der Mineralklasse der „Sulfate (einschließlich Selenate, Tellurate, Chromate, Molybdate und Wolframate)“ mit der chemischen Zusammensetzung Ca6Si2[6][(OH)12|(CO3)2(SO4)2]·12H2O und damit chemisch gesehen ein komplex zusammengesetztes, wasserhaltiges Calcium-Silicium-Sulfat mit zusätzlichen Hydroxid- und Carbonationen. (de)
  • La thaumasite est un minéral silicate de calcium, contenant des atomes de silicium dans une configuration octaédrique inhabituelle, de formule chimique Ca3Si(OH)6(CO3)(SO4)·12H2O, parfois également écrite plus simplement CaSiO3·CaCO3·CaSO4·15H2O. Il se présente sous forme de cristaux hexagonaux prismatiques incolores à blancs, typiquement sous forme de groupes rayonnants aciculaires. On le trouve également en masses fibreuses. Sa dureté est de 3,5 et il a une densité de 1,88 à 1,90. Optiquement, il est uniaxial négatif avec des indices de réfraction nω = 1,507 et nε = 1,468. (fr)
  • Thaumasite is a calcium silicate mineral, containing Si atoms in unusual octahedral configuration, with chemical formula Ca3Si(OH)6(CO3)(SO4)·12H2O, also sometimes more simply written as CaSiO3·CaCO3·CaSO4·15H2O. It occurs as colorless to white prismatic hexagonal crystals, typically as acicular radiating groups. It also occurs as fibrous masses. Its Mohs hardness is 3.5 and it has a specific gravity of 1.88 to 1.90. Optically it is uniaxial negative with indices of refraction of nω = 1.507 and nε = 1.468. (en)
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  • Thaumasite (en)
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  • Thaumasite (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Thaumasite_w-prehnite_Hydrous_basic_calcium_carbonate_sulfate_and_silicate_Fairfax_Quarry_near_Contraville_Fairfax_County_Virginia_1641.jpg
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