{{Short description|Copper silicate hydroxide mineral}} {{Infobox mineral | boxbgcolor = #52b5c4 | name = Shattuckite | category = Inosilicate | image = Shattuckite-rosa20d.jpg | imagesize = 260px | caption = | strunz = 9.DB.40 | formula = Cu<sub>5</sub>(SiO<sub>3</sub>)<sub>4</sub>(OH)<sub>2</sub> | IMAsymbol = Sha<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 = | system = Orthorhombic | class = Dipyramidal (mmm) <br/>H-M symbol: (2/m 2/m 2/m) | symmetry = ''Pcab'' | color = Dark and light blue, turquoise | habit = Commonly spherulitic aggregates of acicular crystals | twinning = | cleavage = perfect along [010] and [100] | fracture = uneven | mohs = 3.5 | luster = Dull to silky | refractive = n<sub>α</sub> = 1.753, n<sub>β</sub> = 1.782, n<sub>γ</sub> = 1.815 | opticalprop = Biaxial (+) | birefringence = | pleochroism = X = very pale blue; Y = pale blue; Z = deep blue | streak = Blue | gravity = 4.1 (rather heavy for a non-metallic mineral) | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Translucent to opaque | other = | references = <ref name=Webmin>[http://webmineral.com/data/Shattuckite.shtml Shattuckite]. Webmineral.com. Retrieved on 2011-10-10.</ref><ref name=Mindat>[http://www.mindat.org/min-3634.html Shattuckite]. Mindat.org (2011-09-08). Retrieved on 2011-10-10.</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/shattuckite.pdf Shattuckite]. Handbook of Mineralogy. (PDF) . Retrieved on 2011-10-10.</ref> }} '''Shattuckite''' is a copper silicate hydroxide mineral with formula Cu<sub>5</sub>(SiO<sub>3</sub>)<sub>4</sub>(OH)<sub>2</sub>. It crystallizes in the orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals. It is closely allied to plancheite in structure and appearance.
Shattuckite is a relatively rare copper silicate mineral. It was first discovered in 1915 in the copper mines of Bisbee, Arizona, specifically the Shattuck Mine (hence the name). It is a secondary mineral that forms from the alteration of other secondary minerals. At the Shattuck Mine, it forms pseudomorphs after malachite. A pseudomorph is an atom by atom replacement of a crystal structure by another crystal structure, but with little alteration of the outward shape of the original crystal. It is sometimes used as a gemstone.<ref>{{Cite web|url=http://www.minerals.net/mineral/shattuckite.aspx|title=Shattuckite: The blue mineral shattuckite information and pictures}}</ref>
==Gallery== <gallery widths="145px" heights="130px"> File:Malachite-Shattuckite-215586.jpg|Shattuckite with malachite, about 4 cm wide. Kaokoveld Mine, Namibia File:Shattuckite-tuc1072a.jpg|Shattuckite crystals form concentric circular clusters of spraying, elongated, acicular crystals. Associated with them are small bits of contrasting primary malachite crystals in a deep green color File:Shattuckite-k-123a.jpg|Botryoidal balls of shattuckite, from the Kaokoveld Mine, Kaokoveld Plateau, Kunene Region, Namibia File:Shattuckite-47277.jpg|Polished shattuckite with malachite, New Cornelia mine, Ajo, Arizona. Size 5.3 × 5.1 × 5.0 cm </gallery>
==References== {{Reflist}}
==External links== {{Commons category}} *[https://www.minerals.net/mineral/shattuckite.aspx Shattuckite] at Minerals.net
Category:Copper(II) minerals Category:Inosilicates Category:Orthorhombic minerals Category:Minerals in space group 61 Category:Gemstones