{{Infobox mineral | name = Masuyite | boxwidth = | boxbgcolor = | image = Masuyite-Uraninite-mun08rad-05b.jpg | imagesize = | alt = | caption = Orange Masuyite coating crystals of cubic uraninite (to about 1 cm). Shinkolobwe mine, the type locality, Democratic Republic of the Congo. | category = Oxide minerals | formula = Pb[(UO<sub>2</sub>)<sub>3</sub>O<sub>3</sub>(OH)<sub>2</sub>]·3H<sub>2</sub>O | IMAsymbol = Msy<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.GB.35 | dana = | system = Monoclinic | class = Domatic (m) <br/><small>(same H-M symbol)</small> | symmetry = ''Pn'' | unit cell = a = 13.98&nbsp;Å, b = 12.11&nbsp;Å, <br/>c = 14.2&nbsp;Å; Z&nbsp;=&nbsp;2 | color = | colour = | habit = | twinning = | cleavage = | fracture = | tenacity = | mohs = | luster = | streak = | diaphaneity = | gravity = | density = | polish = | opticalprop = Biaxial (-) | refractive = n<sub>α</sub> = 1.785 n<sub>β</sub> = 1.895 n<sub>γ</sub> = 1.915 | birefringence = δ = 0.130 | pleochroism = | 2V = Measured: 50°, calculated: 44° | dispersion = extreme | extinction = | length fast/slow = | fluorescence = | absorption = | melt = | fusibility = | diagnostic = | solubility = | impurities = | alteration = | other = 25px Radioactive | prop1 = | prop1text = | references = Masuyite on Mineralienatlas<ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Masuyite Mineralienatlas]</ref> }}

'''Masuyite''' is a uranium/lead oxide mineral with formula Pb[(UO<sub>2</sub>)<sub>3</sub>O<sub>3</sub>(OH)<sub>2</sub>]·3H<sub>2</sub>O.<ref name=Webmineral>[http://www.webmineral.com/data/Masuyite.shtml Webmineral]</ref>

Masuyite was first described in 1947 for an occurrence in Katanga and named to honor Belgian geologist Gustave Masuy (1905–1945).<ref name=handbook>[http://rruff.geo.arizona.edu/doclib/hom/masuyite.pdf Handbook of Mineralogy]</ref>

==See also== {{stack|{{Portal|Earth sciences}}}} * Classification of minerals * List of minerals

==References== {{Reflist}}

{{Commonscat}} Category:Uranium(VI) minerals Category:Lead minerals Category:Oxide minerals Category:Monoclinic minerals Category:Minerals in space group 7 Category:Minerals described in 1947

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