View source for Lópezite

{{Infobox mineral
| name        = Lópezite
| image       = Potassium dichromate (synthetic).jpg
| imagesize   = 260px
| alt         =
| caption     =
| category    = [[Sulfate minerals]] (chromate)
| formula     = K<sub>2</sub>Cr<sub>2</sub>O<sub>7</sub>
| IMAsymbol   = Lpz<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}</ref>
| molweight   =
| strunz      = 7.FD.05
| dana        = 35.2.1.1 Anhydrous chromates
| system      = [[Triclinic crystal system|Triclinic]]
| class       = Pinacoidal ({{overline|1}}) <br/><small>(same [[H-M symbol]])</small>
| symmetry    = ''P''{{overline|1}}
| unit cell   =
| color       = Orange-red, red
| colour      =
| habit       = Granular or spherical in small crystals on the natural environment. Prismatic on lab grown crystals.
| twinning    =
| cleavage    = Perfect<br>[010] perfect, [100] distinct, [001] distinct
| fracture    =
| tenacity    =
| mohs        = {{frac|2|1|2}}
| luster      = Vitreous
| streak      = Light yellow
| diaphaneity = Transparent
| gravity     = 2.69
| density     =
| polish      =
| opticalprop =
| refractive  =
| birefringence =
| pleochroism = Visible
| 2V          =
| dispersion  =
| extinction  =
| length fast/slow =
| fluorescence =
| absorption  =
| melt        =
| fusibility  =
| diagnostic  =
| solubility  = soluble in water
| impurities  =
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| prop1       =
| prop1text   =
| references  = <ref name=Mindat/><ref name=Handbook/>
| other = Health risks: contains the carcinogenic and mutagenic chromate ion.
}}
'''Lópezite''' is a rare red [[Dichromate ion|chromate]] mineral with [[chemical formula]]: [[Potassium|K]]<sub>2</sub>[[Chromium|Cr]]<sub>2</sub>[[Oxygen|O]]<sub>7</sub>. It crystallizes in the [[triclinic crystal system]].<ref name=Mindat>[http://www.mindat.org/min-2433.html Lópezite data on Mindat]</ref><ref name=Handbook>[http://rruff.geo.arizona.edu/doclib/hom/lopezite.pdf Lópezite data in the Handbook of Mineralogy]</ref>
It occurs as rare [[vug]] fillings in nitrate ores in association with [[Tarapacaite|tarapacáite]] (K<sub>2</sub>CrO<sub>4</sub>), [[dietzeite]] and [[ulexite]] in the Chilean [[Atacama]] and is reported from the [[Bushveld igneous complex]] of [[South Africa]].<ref name=Mindat/><ref name=Handbook/> Lópezite was first described in 1937 for an occurrence in Iquique Province, [[Chile]] and named after Chilean mining engineer Emiliano López Saa (1871–1959).<ref name=Mindat/>
Most  commercially available lópezite is artificially produced.<ref name=Mindat/> Synthetic varieties also exhibit [[monoclinic crystal system|monoclinic]] crystals.<ref>Richard V. Gaines, H. Catherine W. Skinner, Eugene E. Foord, Brian Mason, and Abraham Rosenzweig: "[[James Dwight Dana|Dana's]] new mineralogy", p. 692. John Wiley & Sons, 1997</ref>
==References==
{{Reflist}}
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{{Commons category}}
{{DEFAULTSORT:Lopezite}}
[[Category:Potassium minerals]]
[[Category:Chromate minerals]]
[[Category:Triclinic minerals]]
[[Category:Minerals in space group 2]]
[[Category:Minerals described in 1937]]
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