Connellite

{{Short description|Halide mineral}} {{Use dmy dates|date=April 2022}} {{Infobox mineral | name = Connellite | boxwidth = | boxbgcolor = | image = Connellite-54486.jpg | imagesize = 260px | alt = | caption = | category = Halide mineral | formula = Cu₁₉(OH)₃₂(SO₄)Cl₄·3H₂O | IMAsymbol = Cnl<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> | strunz = 3.DA.25 | dana = | system = Hexagonal | class = Dihexagonal dipyramidal (6/mmm) <br/>H-M symbol: (6/m 2/m 2/m) | symmetry = ''P''6₃/mmc | unit cell = a = 15.78&nbsp;Å, c = 9.10&nbsp;Å; Z&nbsp;=&nbsp;1 | color = Azure blue, blue green | habit = Clusters of divergent acicular crystals, fibrous, crusts | twinning = | cleavage = None | fracture = Splintery | tenacity = Brittle | mohs = 3 | luster = Vitreous | streak = Pale green-blue | diaphaneity = Translucent | gravity = 3.36 to 3.41 | density = | polish = | opticalprop = Uniaxial (+) | refractive = n_ω = 1.724 – 1.746 n_ε = 1.738 – 1.758 | birefringence = δ = 0.014 | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = | references = <ref>https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Connellite Mineralienatlas</ref><ref name=HBM>[http://rruff.info/doclib/hom/connellite.pdf Connellite in the Handbook of Mineralogy]</ref><ref name=Mindat/><ref>[http://www.webmineral.com/data/Connellite.shtml#.U7VdXvldXfI Connellite data on Webmineral]</ref> }} '''Connellite''' is a rare mineral species, a hydrous copper chloro-sulfate,<ref name=EB1911>{{EB1911|wstitle=Connellite|volume=6|page=963|inline=1}}</ref> Cu₁₉(OH)₃₂(SO₄)Cl₄·3H₂O, crystallizing in the hexagonal system. It occurs as tufts of very delicate acicular crystals of a fine blue color, and is associated with other copper minerals of secondary origin, such as cuprite and malachite. Its occurrence in Cornwall, England was noted by Philip Rashleigh in 1802, and it was first examined chemically by Prof Arthur Connell FRSE in 1847, after whom it is named.<ref name=EB1911/>

The type locality is Wheal Providence at Carbis Bay in Cornwall.<ref name=Mindat>[http://www.mindat.org/min-1120.html Connellite: Connellite mineral information on Mindat.org]</ref> Outside Cornwall it has been found in over 200 locations worldwide including Namaqualand in South Africa and at Bisbee, Arizona (US).<ref name=Mindat/> thumb|center|350px|Connellite crystal structure: ''Color code:'' Cu: copper, S: olive, O: red, Cl: green; Cell: magenta

==References== {{Portal|Cornwall}} {{reflist}}

Category:Copper(II) minerals Category:Halide minerals Category:Sulfate minerals Category:Hexagonal minerals Category:Minerals in space group 194

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