# Derriksite

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> Source: https://en.wikipedia.org/wiki/Derriksite
> Source revision: 1260529372
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{{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](/source/malachite), the matrix is selenium-rich [digenite](/source/digenite)
| category    = [Oxide minerals](/source/Oxide_minerals)
| formula     = Cu<sub>4</sub>(UO<sub>2</sub>)(SeO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>•H<sub>2</sub>O
| 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](/source/H-M_symbol): (mm2)
| symmetry    = ''P''n2<sub>1</sub>m
| 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 = 
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| birefringence = 
| pleochroism = 
| 2V          = 
| dispersion  = 
| extinction  = 
| length fast/slow =
| fluorescence = 
| absorption  = 
| melt        = 
| fusibility  = 
| diagnostic  = 
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| impurities  = 
| alteration  = 
| other       = 25px [Radioactive](/source/Radioactive)
| prop1       = 
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| references  = 
}}

'''Derriksite''' is a very rare [uranium](/source/uranium) [mineral](/source/mineral) with the chemical formula Cu<sub>4</sub>(UO<sub>2</sub>)(SeO<sub>3</sub>)<sub>2</sub>(OH)<sub>6</sub>•H<sub>2</sub>O. It is a secondary mineral that contains [copper](/source/copper), uranium and the rarer [selenium](/source/selenium). It is a bright green to duller bottle green colour. Its [crystal habit](/source/crystal_habit) is acicular, it is most likely to be found along with the uranyl selenium mineral [demesmaekerite](/source/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](/source/Mohs_hardness) of about 2.<ref>{{cite web |url=http://www.mindat.org/min-1264.html |title=Derriksite |publisher=[mindat.org](/source/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 Cu<sub>4</sub>(UO<sub>2</sub>)(SeO<sub>3</sub>)<sub>2</sub>•(H<sub>2</sub>O) une nouvelle espece minérale}}
*{{cite journal | doi = 10.1107/S0108270183009439 | title = Structure de la derriksite, Cu<sub>4</sub>(UO<sub>2</sub>)(SeO<sub>3</sub>)<sub>2</sub>•(H<sub>2</sub>O) | 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

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Adapted from the Wikipedia article [Derriksite](https://en.wikipedia.org/wiki/Derriksite) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Derriksite?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.