{{Infobox mineral | name = Tarapacáite | boxwidth = | boxbgcolor = | image = | imagesize = | alt = | caption = | category = Sulfate minerals | formula = K<sub>2</sub>(CrO<sub>4</sub>) | molweight = | strunz = 7.FA.05 | dana = 35.2.1.1.1 Anhydrous chromates | system = Orthorhombic | class = Dipyramidal (mmm) <br/>H-M symbol: (2/m 2/m 2/m) | symmetry = ''Pnam'' (no. 62) | unit cell = | color = Bright yellow, yellow-orange | colour = | habit = Thick tabular | twinning = | cleavage = Distinct/good <br/>On {001} and {010}, distinct | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = Transparent | gravity = 2.735 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = Soluble in water | impurities = | alteration = | other = Health risks: contains the carcinogenic and mutagenic chromate ion | prop1 = | prop1text = | references = <ref name=Mindat>[https://www.mindat.org/min-3891.html Mindat]</ref> }} '''Tarapacáite''' is the mineral form of potassium chromate with the chemical formula K<sub>2</sub>CrO<sub>4</sub>. It forms bright yellow crystals and was discovered in 1878. It is named for the former Tarapacá Province, Peru; nowadays belonging to Chile. The boundaries between Peru, Bolivia and Chile were vague in the Atacama Desert before the War of the Pacific (1879–1883). Its type locality is Oficina Maria Elena, Maria Elena, Tocopilla Province, Antofagasta Region, Chile. It is unlikely to occur anywhere except in highly arid conditions as it is easily soluble in water.<ref name=Mindat /><ref>[http://webmineral.com/data/Tarapacaite.shtml Webmineral.com - Tarapacaite]</ref><ref>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/tarapacaite.pdf |title=Handbook of Mineralogy (HOM - MSA) - Tarapacaite |access-date=2013-01-25 |archive-date=2012-07-16 |archive-url=https://web.archive.org/web/20120716013752/http://www.handbookofmineralogy.com/pdfs/tarapacaite.pdf |url-status=dead }}</ref>
==References== {{reflist}}
Category:Potassium minerals Category:Chromate minerals Category:Orthorhombic minerals Category:Minerals in space group 62 Category:Minerals described in 1878
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