{{Short description|Colorless silicate mineral}} {{Infobox mineral | name = Alamosite | category = Inosilicates | image = Alamosite-Leadhillite-Melanotekite-ea6a.jpg | caption = Transparent crystals of alamosite in the matrix of leadhillite and melanotekite | formula = Pb<sub>12</sub>Si<sub>12</sub>O<sub>36</sub> |IMAsymbol=Aam<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 = 9.DO.20 | dana = 65.7.1.1 | system = Monoclinic | class = Prismatic (2/m) <br/><small>(same H-M symbol)</small> | symmetry = ''P''2/c | unit cell = a = 11.209, b = 7.041 <br/>c = 12.22&nbsp;[Å]; β = 113.15°; Z&nbsp;=&nbsp;12 | color = Colorless | habit = | twinning = | cleavage = {010} perfect | fracture = | tenacity = | mohs = 4.5 | luster = Adamantine | refractive = n<sub>α</sub> = 1.947, n<sub>β</sub> = 1.961, n<sub>γ</sub> = 1.968 | opticalprop = Biaxial (−) | birefringence = δ = 0.021 | 2V = 65° (meas.) | pleochroism = | streak = White | gravity = 6.49 | density = | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Transparent to translucent | other = | references = <ref name=mindat>[http://www.mindat.org/min-93.html Alamosite]. Webmineral. Retrieved on 2011-10-10.</ref><ref>[http://www.mindat.org/min-93.html Alamosite Mineral Data]. Mindat.org. Retrieved on 2011-10-10.</ref> }}

'''Alamosite''' (Pb<sub>12</sub>Si<sub>12</sub>O<sub>36</sub>) is a colorless silicate mineral named after the place where it was discovered, Álamos, Sonora, Mexico. It is a rare secondary mineral occurring in the oxidized zones of lead-rich deposits. For example, the infobox picture shows its association with black leadhillite.<ref name=mindat/>

==References== {{reflist}}

Category:Inosilicates Category:Monoclinic minerals Category:Minerals in space group 13

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