# Andersonite

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> Markdown URL: https://mediated.wiki/source/Andersonite.md
> Source: https://en.wikipedia.org/wiki/Andersonite
> Source revision: 1275025065
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{{Short description|Uranyl carbonate mineral}}
{{Infobox mineral
| name        = Andersonite
| image       = File:Andersonite-37032.jpg
| imagesize   = 260px
| alt         = 
| caption     = Andersonite crystals from the Repete Mine, Blanding, San Juan County, Utah (size: 5.2 x 3.6 x 1.5 cm)
| category    = [Carbonate minerals](/source/Carbonate_minerals)
| formula     = Na<sub>2</sub>Ca(UO<sub>2</sub>)(CO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O
|IMAsymbol=Anr<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>
| strunz      = 5.ED.30
| dana        = 
| system      = [Trigonal](/source/Trigonal)
| class       = Hexagonal scalenohedral ({{overline|3}}m) <br/>[H-M symbol](/source/H-M_symbol): ({{overline|3}} 2/m)
| symmetry    = ''R''{{overline|3}}m
| unit cell   = a = 18, c = 23.83&nbsp;[Å]; Z&nbsp;=&nbsp;18
| color       = Bright green to yellow-green
| habit       = Rhombohedra, often flattened, pseudocubic; crystalline crusts, granular
| twinning    = 
| cleavage    = 
| fracture    = 
| tenacity    = 
| mohs        = 2.5
| luster      = Vitreous
| streak      = 
| diaphaneity = Transparent to translucent
| gravity     = 2.8
| density     = 
| polish      = 
| opticalprop = Uniaxial (+)
| refractive  = n<sub>ω</sub> = 1.520 n<sub>ε</sub> = 1.540
| birefringence = δ = 0.020
| pleochroism = Visible O = colorless E = Light yellow
| 2V          = 
| dispersion  = 
| extinction  = 
| length fast/slow =
| fluorescence = bright pale green to yellow-green
| absorption  = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = Soluble in water
| impurities  = 
| alteration  = 
| other       = 25px [Radioactive](/source/Radioactive)
| references  = <ref name=HBM>[http://rruff.info/doclib/hom/andersonite.pdf Andersonite in the Handbook of Mineralogy]</ref><ref name=Mindat>[http://www.mindat.org/min-219.html Mineralogical data about Andersonite on Mindat.org]</ref><ref name=Webmin>[http://webmineral.com/data/Andersonite.shtml Andersonite data on Webmineral]</ref>
}}

'''Andersonite''', Na<sub>2</sub>Ca(UO<sub>2</sub>)(CO<sub>3</sub>)<sub>3</sub>·6H<sub>2</sub>O, or [hydrated](/source/hydrated) [sodium](/source/sodium) [calcium](/source/calcium) [uranyl](/source/uranyl) [carbonate](/source/carbonate) is a rare [uranium](/source/uranium) [carbonate mineral](/source/carbonate_mineral) that was first described in 1948. Named after [Charles Alfred Anderson](/source/Charles_Alfred_Anderson) (1902–1990) of the [United States Geological Survey](/source/United_States_Geological_Survey), who first described the mineral species, it is found in [sandstone](/source/sandstone)-hosted uranium deposits. It has a high vitreous to pearly [luster](/source/Lustre_(mineralogy)) and is [fluorescent](/source/fluorescent). Andersonite specimens will usually glow a bright lemon yellow (or green with blue hints depending on the deposit) in [ultraviolet](/source/ultraviolet) light.  It is commonly found as translucent small rhombohedral crystals that have angles close to 90 degrees although its [crystal](/source/crystal) system is nominally trigonal. Its [Mohs hardness](/source/Mohs_scale_of_mineral_hardness) is 2.5, with an average [specific gravity](/source/specific_gravity) of 2.8.

It occurs in the [oxidized](/source/Redox) zone of uranium-bearing [polymetallic](/source/polymetallic) [ore deposit](/source/ore_deposit)s. It also may occur as an [efflorescent](/source/efflorescent) crust on the walls and timbers of [uranium mine](/source/uranium_mine)s.  As this mineral is water-soluble, samples must be stored in dry conditions. It occurs with [schrockingerite](/source/schrockingerite), [bayleyite](/source/bayleyite), [schwarzites](/source/schwarzites), [boltwoodite](/source/boltwoodite), [liebigite](/source/liebigite) and [gypsum](/source/gypsum).<ref name=HBM/>

It was first described in 1948 for an occurrence in the Hillside Mine near [Bagdad](/source/Bagdad%2C_Arizona), Eureka District, [Yavapai County, Arizona](/source/Yavapai_County%2C_Arizona).<ref name=Mindat/>

==References==
{{Reflist}}

Category:Sodium minerals
Category:Calcium minerals
Category:Uranium(VI) minerals
Category:Carbonate minerals
Category:Hexahydrate minerals
Category:Trigonal minerals
Category:Minerals in space group 166
Category:Minerals described in 1948

{{carbonate-mineral-stub}}

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