# Letovicite

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> Source: https://en.wikipedia.org/wiki/Letovicite
> Source revision: 1259325942
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{{Short description|Ammonium sulfate mineral}}
{{Infobox mineral
| name        = Letovicite
| category    = [Sulfate mineral](/source/Sulfate_mineral)
| image       = Letovicite.jpg
| imagesize   = 
| alt         = 
| caption     = White crystals of ammonium sulfate mineral letovicite from the Anna 2 Mine, Aachen, North Rhine – Westphalia, Germany.  
| formula     = (NH<sub>4</sub>)<sub>3</sub>H(SO<sub>4</sub>)<sub>2</sub>
| IMAsymbol   = Let<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      = 07.AD.20
| dana        = 28.1.3.1
| system      = [Monoclinic](/source/Monoclinic)
| class       = Prismatic (2/m)
| symmetry    = ''C2/c'' (no. 15)
| unit cell   = 
| color       = Colorless, white
| habit       = Tiny pseudo-hexagonal plates, granular
| twinning    = Lamellar twinning
| cleavage    = Distinct on {001}
| fracture    = Uneven
| tenacity    = 
| mohs        = 1–2
| luster      = 
| refractive  = 
| opticalprop = Biaxial (−), colorless (transmitted light)
| birefringence = 
| 2V = 75° (calc.)
| pleochroism = 
| streak      = 
| gravity     = 1.83
| density     = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = Soluble in water
| diaphaneity = Transparent
| other       = 
| references = <ref>{{cite journal |last1=Leclaire |first1=A. |last2=Ledésert |first2=M. |last3=Monier |first3=J. C. |last4=Daoud |first4=A. |last5=Damak |first5=M. |title=Structure du disulfate acide de triammonium. Une redétermination. Relations des chaînes de liaisons hydrogène avec la morphologie et la conductivité électrique |journal=Acta Crystallographica Section B: Structural Science |date=1 August 1985 |volume=41 |issue=4 |pages=209–213 |doi=10.1107/S0108768185002002|bibcode=1985AcCrB..41..209L }}</ref>
}}

'''Letovicite''' ({{IPAc-en|l|ɛ|t|oʊ|ˈ|v|ɪ|s|aɪ|t}}) is an [ammonium](/source/ammonium) [sulfate mineral](/source/sulfate_mineral) with composition (NH<sub>4</sub>)<sub>3</sub>H(SO<sub>4</sub>)<sub>2</sub> (IUPAC: triammonium sulfate hydrogensulfate, [Nickel–Strunz classification](/source/Nickel%E2%80%93Strunz_classification) 07.AD.20).

It is a rare colorless or white [monoclinic](/source/monoclinic) secondary mineral formed during the burning of [waste coal](/source/Coal_refuse) heaps and as a deposit in [hot spring](/source/hot_spring)s. It was first described from the [Letovice](/source/Letovice) region of [Moravia](/source/Moravia) in 1932. Geologic occurrences also include [Austria](/source/Austria), [Germany](/source/Germany), [Hungary](/source/Hungary), [Italy](/source/Italy), [Poland](/source/Poland), [South Africa](/source/South_Africa), [Tajikistan](/source/Tajikistan) and the [United States](/source/United_States).

==References==
{{Reflist}}
*[http://www.mindat.org/min-2382.html Letovicite] 
*[http://www.webmineral.com/data/Letovicite.shtml Letovicite Mineral Data] 
*[http://www.handbookofmineralogy.com/pdfs/letovicite.pdf Letovicite] {{Webarchive|url=https://web.archive.org/web/20150924140308/http://www.handbookofmineralogy.com/pdfs/letovicite.pdf |date=2015-09-24 }} 
*[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Letovicite Letovicite]

==Bibliography==
*<small>Palache, P.; Berman H.; Frondel, C. (1960). "''Dana's System of Mineralogy, Volume II: Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Etc. (Seventh Edition)"'' John Wiley and Sons, Inc., New York, pp.&nbsp;397.</small>

{{Authority control}}

Category:Sulfate minerals
Category:Ammonium minerals
Category:Monoclinic minerals
Category:Minerals in space group 15

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