{{Infobox mineral | name = Marthozite | category = Oxide mineral (uranyl selenite) | boxwidth = | boxbgcolor = | image = Marthozite-jr-6b.jpg | imagesize = 260px | caption = Marthozite crystals in a vug, from Katanga (size: 6.2 x 5.3 x 4.0 cm) | formula = Cu(UO<sub>2</sub>)<sub>3</sub>(SeO<sub>3</sub>)<sub>3</sub>(OH)<sub>2</sub>·7H<sub>2</sub>O | IMAsymbol = Mhz<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 = 1,303.67 g/mol | strunz = 4.JJ.05 | system = Orthorhombic | class = Pyramidal (mm2) <br/><small>(same H-M symbol)</small> | symmetry = ''Pbn2''<sub>1</sub> | unit cell = a = 16.4 Å, b = 17.2 Å, <br/>c = 6.98 Å; Z = 4 | color = Greenish brown | habit = Bladed | twinning = | cleavage = {100} perfect, {010} indistinct | fracture = | tenacity = | mohs = 6 | luster = | refractive = 1.780–1.800 | opticalprop = Biaxial (−) | birefringence = | dispersion = Extreme | pleochroism = Yellowish brown to greenish yellow | 2V = 39° | streak = | gravity = 4.44 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = | other = 25px Radioactive | references = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Marthozite Mineralienatlas]</ref><ref name=webmin>[http://webmineral.com/data/Marthozite.shtml Webmineral data]</ref><ref name=Mindat>[http://www.mindat.org/min-2582.html Mindat.org]</ref><ref name=HBM>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/marthozite.pdf |title=Handbook of Mineralogy |access-date=2010-12-13 |archive-date=2021-07-23 |archive-url=https://web.archive.org/web/20210723102459/http://www.handbookofmineralogy.com/pdfs/marthozite.pdf |url-status=dead }}</ref> }}
'''Marthozite''' is an orthorhombic mineral that has a general formula of Cu(UO<sub>2</sub>)<sub>3</sub>(SeO<sub>3</sub>)<sub>3</sub>(OH)<sub>2</sub>·7H<sub>2</sub>O.<ref name=Mindat/> It was named after Belgian mineralogist Aimé Marthoz (1894–1962), former Director-general of the Union Minière du Haut Katanga (UMHK).<ref name=webmin />
It is usually found in cavities in selenian (selenium-containing) digenite.<ref name=webmin /> It is specifically found in the zones of oxidation of the Musonoi deposit in Katanga, Africa.<ref name=Fleischer>Fleischer, M. (1970) New mineral names. American Mineralogist, 55, 533.</ref>
Marthozite is orthorhombic, meaning that it has three axes of unequal lengths all orthogonal to each other. Since it is orthorhombic, marthozite is biaxial, meaning that it has three different indices of refraction.<ref name=Fleischer/> Marthozite is anisotropic, which means that it breaks light into one fast ray and one slow ray.<ref name=Wolfrmalpha>{{Cite web|url = http://www.wolframalpha.com/entities/minerals/marthozite/u7/vh/op/|title = Marthozite|accessdate = 5 June 2019}}{{Dead link|date=April 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref> Marthozite shows pleochroism from yellowish brown to greenish yellow.<ref name=webmin />
== References == {{Reflist}}
Category:Copper(II) minerals Category:Selenite minerals Category:Uranium(VI) minerals Category:Hydroxide minerals Category:Heptahydrate minerals Category:Orthorhombic minerals Category:Minerals in space group 33 Category:Minerals described in 1969
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