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Thaumasite abstract "Thaumasite is a silicate mineral with chemical formula Ca3Si(OH)6(CO3)(SO4)·12H2O. 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. It occurs as a hydrothermal alteration mineral in sulfide ore deposits and geothermal alteration of basalt and tuff. It occurs with zeolites, apophyllite, analcime, calcite, gypsum and pyrite.Thaumasite can also be formed along with other calcium silicate hydrates (CSH) during cement alteration, especially when sulfate attack develops.It was first described in 1878 in Sweden and named from the Greek, \"thaumazein\", to be surprised, in reference to its unusual composition with carbonate, sulfate and hydroxysilicate anions.The silicate structure of thaumasite is unusual due to the presence of non-tetrahedral silicon in its crystal lattice. Indeed, an atypic octahedral configuration is observed for Si present in thaumasite in the form of hexahydroxysilicate: [Si(OH)6]2−, a species exhibiting a geometry similar to that of the hexafluorosilicate [SiF6]2−.".
Thaumasite thumbnail Thaumasite_w-prehnite_Hydrous_basic_calcium_carbonate_sulfate_and_silicate_Fairfax_Quarry_near_Contraville_Fairfax_County_Virginia_1641.jpg?width=300.
Thaumasite wikiPageExternalLink sulfate.html.
Thaumasite wikiPageExternalLink f67125433f87c0db9e029b368c957ec1.
Thaumasite wikiPageExternalLink cdd4c383057e2d08e0e3147c980dd41b.
Thaumasite wikiPageID "9455578".
Thaumasite wikiPageLength "6404".
Thaumasite wikiPageOutDegree "43".
Thaumasite wikiPageRevisionID "688390046".
Thaumasite wikiPageWikiLink Acicular_(crystal_habit).
Thaumasite wikiPageWikiLink Afwillite.
Thaumasite wikiPageWikiLink Analcime.
Thaumasite wikiPageWikiLink Apophyllite.
Thaumasite wikiPageWikiLink Basalt.
Thaumasite wikiPageWikiLink Calcite.
Thaumasite wikiPageWikiLink Calcium.
Thaumasite wikiPageWikiLink Calcium_silicate_hydrate.
Thaumasite wikiPageWikiLink Carbon.
Thaumasite wikiPageWikiLink Category:Calcium_minerals.
Thaumasite wikiPageWikiLink Category:Carbonate_minerals.
Thaumasite wikiPageWikiLink Category:Cement.
Thaumasite wikiPageWikiLink Category:Concrete.
Thaumasite wikiPageWikiLink Category:Hydrates.
Thaumasite wikiPageWikiLink Category:Sulfate_minerals.
Thaumasite wikiPageWikiLink Cement.
Thaumasite wikiPageWikiLink Crystal_structure.
Thaumasite wikiPageWikiLink Greek_language.
Thaumasite wikiPageWikiLink Gypsum.
Thaumasite wikiPageWikiLink Hexafluorosilicic_acid.
Thaumasite wikiPageWikiLink Hexagonal_crystal_system.
Thaumasite wikiPageWikiLink Hydrogen.
Thaumasite wikiPageWikiLink Jennite.
Thaumasite wikiPageWikiLink Metasomatism.
Thaumasite wikiPageWikiLink Mohs_scale_of_mineral_hardness.
Thaumasite wikiPageWikiLink Octahedron.
Thaumasite wikiPageWikiLink Oxygen.
Thaumasite wikiPageWikiLink Prehnite.
Thaumasite wikiPageWikiLink Pyrite.
Thaumasite wikiPageWikiLink Refractive_index.
Thaumasite wikiPageWikiLink Silicate.
Thaumasite wikiPageWikiLink Silicate_minerals.
Thaumasite wikiPageWikiLink Silicon.
Thaumasite wikiPageWikiLink Specific_gravity.
Thaumasite wikiPageWikiLink Sulfate_attack_in_concrete_and_mortar.
Thaumasite wikiPageWikiLink Sulfate_minerals.
Thaumasite wikiPageWikiLink Sulfur.
Thaumasite wikiPageWikiLink Tobermorite.
Thaumasite wikiPageWikiLink Tuff.
Thaumasite wikiPageWikiLink Water.
Thaumasite wikiPageWikiLink Zeolite.
Thaumasite wikiPageWikiLink File:Thaumasite-251460.jpg.
Thaumasite wikiPageWikiLinkText "Thaumasite".
Thaumasite wikiPageWikiLinkText "thaumasite".
Thaumasite birefringence "δ = 0.039".
Thaumasite caption "Thaumasite with prehnite from Fairfax Quarry, Virginia".
Thaumasite category Sulfate_minerals.
Thaumasite cleavage "Indistinct".
Thaumasite color "Colorless, white, pale yellow".
Thaumasite diaphaneity "Transparent to translucent".
Thaumasite formula "Ca3Si6·12H2O".
Thaumasite formula "CaSi6·CaCO3·CaSO4·12H2O".
Thaumasite formula "CaSiO3·CaCO3·CaSO4·15H2O".
Thaumasite fracture "Subconchoidal".
Thaumasite gravity "1.877".
Thaumasite habit "Prismatic, fibrous, massive, radial".
Thaumasite luster "Vitreous to silky".
Thaumasite mohs "3.5".
Thaumasite molweight "622.62".
Thaumasite name "Thaumasite".
Thaumasite opticalprop "Uniaxial".
Thaumasite refractive "nω = 1.498–1.507 nε = 1.458–1.470".
Thaumasite streak "White".
Thaumasite strunz "7".
Thaumasite symmetry "Hexagonal 6".
Thaumasite system "Hexagonal dipyramidal".
Thaumasite tenacity "Brittle".
Thaumasite unitCell "a = 11.030 Å, c = 10.396 Å; Z = 2".
Thaumasite wikiPageUsesTemplate Template:Cite_journal.
Thaumasite wikiPageUsesTemplate Template:Infobox_mineral.
Thaumasite wikiPageUsesTemplate Template:Reflist.
Thaumasite subject Category:Calcium_minerals.
Thaumasite subject Category:Carbonate_minerals.
Thaumasite subject Category:Cement.
Thaumasite subject Category:Concrete.
Thaumasite subject Category:Hydrates.
Thaumasite subject Category:Sulfate_minerals.
Thaumasite hypernym Mineral.
Thaumasite type ChemicalSubstance.
Thaumasite type Mineral.
Thaumasite type Silicate.
Thaumasite type Sulfate.
Thaumasite type ChemicalObject.
Thaumasite type Thing.
Thaumasite type Q7946.
Thaumasite comment "Thaumasite is a silicate mineral with chemical formula Ca3Si(OH)6(CO3)(SO4)·12H2O. 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. It occurs as a hydrothermal alteration mineral in sulfide ore deposits and geothermal alteration of basalt and tuff.".
Thaumasite label "Thaumasite".
Thaumasite sameAs Q2706126.
Thaumasite sameAs Thaumasita.
Thaumasite sameAs Thaumasit.
Thaumasite sameAs Taumasita.