{{Short description|Hydrated iron sulfate mineral}} {{Infobox mineral | name = Copiapite | category = Sulfate minerals | image = Copiapite-159310.jpg | caption = Copiapite from the Bolesław Mine, Kłodzko District, Lower Silesia, Poland | formula = Fe<sup>2+</sup>Fe<sup>3+</sup><sub>4</sub>(SO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>·20(H<sub>2</sub>O) | IMAsymbol = Cpi<ref>{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|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.DB.35 | dana = | system = Triclinic | class = Pinacoidal ({{overline|1}}) <br/><small>(same H-M symbol)</small> | symmetry = ''P''{{overline|1}} | unit cell = a = 7.337&nbsp;Å, b = 18.76&nbsp;Å, <br/>c = 7.379&nbsp;Å; α = 91.47°, <br/>β = 102.18°, γ = 98.95°; Z&nbsp;=&nbsp;1 | color = Sulfur-yellow to orange when crystalline, greenish-yellow to olive-green when massive | colour = | habit = Tabular pseudo-orthorhombic platy crystals, typically in scaly incrustations or granular pulverulent aggregates | twinning = Contact twins | cleavage = Perfect on {{mset|010}}, imperfect on {{mset|{{overline|1}}01}} | fracture = Irregular/uneven, micaceous | tenacity = Fragile | mohs = 2.5–3 | luster = Pearly on {010} | streak = | diaphaneity = Transparent to translucent | gravity = 2.04–2.17 | density = | polish = | opticalprop = Biaxial (+) | refractive = n<sub>α</sub> = 1.506 – 1.540 n<sub>β</sub> = 1.528 – 1.549 n<sub>γ</sub> = 1.575 – 1.600 | birefringence = δ = 0.069 | pleochroism = X = Y = pale yellow to colorless; Z = sulfur-yellow | 2V = Measured: 45° to 74°, Calculated: 48° to 72° | dispersion = | extinction = | length fast/slow = | fluorescence= | absorption = | melt = | fusibility = | diagnostic = | solubility = Soluble in water | other = | alteration = | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Copiapite Mineralienatlas]</ref><ref name=Handbook>[https://rruff.geo.arizona.edu/doclib/hom/copiapite.pdf Handbook of Mineralogy]</ref><ref name=NAS>[http://www.pnas.org/content/96/7/3455.full (Nordstrom and Alpers, 1999)]</ref><ref name=Mindat>[http://www.mindat.org/min-1124.html Mindat.org]</ref> }} '''Copiapite''' is a hydrated iron sulfate mineral with formula: Fe<sup>2+</sup>Fe<sup>3+</sup><sub>4</sub>(SO<sub>4</sub>)<sub>6</sub>(OH)<sub>2</sub>·20(H<sub>2</sub>O).<ref name=Handbook/> Copiapite can also refer to a mineral group, the copiapite group.

Copiapite is strictly a secondary mineral forming from the weathering or oxidation of iron sulfide minerals or sulfide-rich coal. Its most common occurrence is as the end member mineral from the rapid oxidation of pyrite. It also occurs rarely with fumaroles. It occurs with melanterite, alunogen, fibroferrite, halotrichite, botryogen, butlerite and amarantite.<ref name=Handbook/> It is by far the most common mineral in the copiapite group.

It rarely occurs as single crystals, is in the triclinic crystal system, and is pale to bright yellow. It is soluble in water, changing the water color to deep orange or orangish-red. In solution copiapite is very acidic. In high concentrations a negative pH can occur, as reported in waters draining from Richmond Mine at Iron Mountain, California.<ref name=NAS/> Copiapite can easily be distinguished from native sulfur because it does not give off an odor when dissolved in water. It can be distinguished from similar appearing uranium minerals, such as carnotite, by its lack of radioactivity. The only way to differentiate between the minerals in the copiapite group is by X-ray diffraction.

Copiapite was first described in 1833 for an occurrence near Copiapó, Atacama, Chile.<ref name=Mindat/> It is sometimes known as ''yellow copperas''. Other occurrences are in California, Nevada, and in the filled paleo sinkholes and caves of Missouri.

[[File:Copiapite-199662.jpg|thumb|none|Lustrous, micaceous crystals of copiapite to 8 mm on matrix from the Alcaparrosa Mine, El Loa Province, Antofagasta Region, Chile (sample size: 11.9 × 7.4 × 4.0 cm)]]

==See also== {{Portal|Earth sciences}} * Classification of minerals * List of minerals

==References== {{Reflist}}

{{Commons category}}

Category:Iron(II,III) minerals Category:Sulfate minerals Category:Triclinic minerals Category:Minerals in space group 2 Category:Minerals described in 1833