Derriksite

{{Infobox mineral | name = Derriksite | image = Derriksite-Malachite-201073.jpg | imagesize = 260px | alt = | caption = Crystals of copper-uranium-selenite derriksite (bottle green) on a bed of malachite, the matrix is selenium-rich digenite | category = Oxide minerals | formula = Cu₄(UO₂)(SeO₃)₂(OH)₆•H₂O | IMAsymbol = Drk<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 = 4.JG.30 | system = Orthorhombic | class = Pyramidal (mm2) <br/>H-M symbol: (mm2) | symmetry = ''P''n2₁m | unit cell = | colour = Bottle green, green | color = | habit = | twinning = | cleavage = {???} perfect, {010} good | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = Translucent | gravity = 4.72 | density = | polish = | opticalprop = | refractive = | birefringence = | pleochroism = | 2V = | dispersion = | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = 25px Radioactive | prop1 = | prop1text = | references = }}

'''Derriksite''' is a very rare uranium mineral with the chemical formula Cu₄(UO₂)(SeO₃)₂(OH)₆•H₂O. It is a secondary mineral that contains copper, uranium and the rarer selenium. It is a bright green to duller bottle green colour. Its crystal habit is acicular, it is most likely to be found along with the uranyl selenium mineral demesmaekerite, but derriksite is much rarer than demesmaekerite. It is named after Jean Marie Francois Joseph Derriks (1912–1992), geologist and administrator of the Union Minière du Haut Katanga (UMHK). It has a Mohs hardness of about 2.<ref>{{cite web |url=http://www.mindat.org/min-1264.html |title=Derriksite |publisher=mindat.org |accessdate=January 11, 2013}}</ref>

==References== {{reflist}}

==Further reading== *{{cite journal| journal = Bull. Soc. Fr. Mineral. Cristallogr| year = 1971| volume = 94| pages = 534–537| url = http://rruff.info/uploads/BSFMC94_534.pdf| first1= Th. | last1 = Verbeek| first2= R. | last2 = Pierrot| title = La Derriksite Cu₄(UO₂)(SeO₃)₂•(H₂O) une nouvelle espece minérale}} *{{cite journal | doi = 10.1107/S0108270183009439 | title = Structure de la derriksite, Cu₄(UO₂)(SeO₃)₂•(H₂O) | year = 1983 | last1 = Ginderow | first1 = D. | last2 = Cesbron | first2 = F. | journal = Acta Crystallographica Section C | volume = 39 | issue = 12 | pages = 1605}} *{{cite journal | doi = 10.1255/jnirs.813 | title = An application of near infrared and mid-infrared spectroscopy to the study of uranyl selenite minerals: Derriksite, demesmaekerite, guilleminite and haynesite | year = 2008 | last1 = Frost | first1 = Ray | last2 = Jagannadha Reddy | first2 = B. | last3 = Dickfos | first3 = Marilla | journal = Journal of Near Infrared Spectroscopy | volume = 16 | issue = 5 | pages = 455–469|bibcode = 2008JNIS...16..455F | s2cid = 96401790 }}

Category:Uranium(VI) minerals Category:Selenite minerals Category:Copper(II) minerals Category:Hydroxide minerals Category:Orthorhombic minerals Category:Minerals in space group 31 Category:Minerals described in 1971