# Fettelite

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> Source: https://en.wikipedia.org/wiki/Fettelite
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{{Infobox mineral
| name        = Fettelite
| category    = [Sulfosalt mineral](/source/Sulfosalt_mineral)
| boxwidth    = 
| boxbgcolor  = 
| image       =  Fettelite-14124.jpg
| imagesize   = 260px
| caption     = Cluster of tiny fettelite crystals in a vug from Copiapó, Atacama Region, Chile
| formula     = Ag<sup>1+</sup><sub>16</sub>Hg<sup>2+</sup>As<sup>3+</sup><sub>4</sub>S<sup>2-</sup><sub>15</sub> (rruff) or <br/>[Ag<sub>6</sub>As<sub>2</sub>S<sub>7</sub>][Ag<sub>10</sub>HgAs<sub>2</sub>S<sub>8</sub>] (mindat.org)
| IMAsymbol   = Ftt<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      = 2.LA.30
| system      = [Monoclinic](/source/Monoclinic)
| class       = Sphenoidal (2) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''C2''
| unit cell   = a = 15.00, c = 15.46&nbsp;[Å] <br/>V = 3014&nbsp;Å<sup>3</sup>; Z&nbsp;=&nbsp;8 
| color       = dark violet to red
| habit       = flakes, hexagonal, micaceous
| twinning    = intimately twinned with six twin domains
| cleavage    = perfect
| fracture    = subconchoidal
| tenacity    = 
| mohs        = 3.5
| luster      = metallic
| refractive  = N(calc) = 1.74
| opticalprop = Biaxial,  anisotrophism weak with strong red internal reflections
| birefringence = moderate white to brownish gray
| pleochroism = 
| streak      = dark vermillion
| gravity     = 6.29
| density     = 
| melt        = 
| fusibility  = 
| diagnostic  = 
| solubility  = 
| diaphaneity = subopaque to opaque
| other       = 
| references  = <ref>[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Fettelite Mineralienatlas]</ref><ref name=Mindat>[http://www.mindat.org/min-1543.html Mindat.org] Accessed 4 November 2010 </ref><ref name=Jambor>{{Cite journal |last1=Jambor |first1=John L. |last2=Puziewicz |first2=Jacek |last3=Roberts |first3=Andrew C. |year=1997 |title=New mineral name |journal=American Mineralogist |volume=82 |pages=620–624 |url=http://www.minsocam.org/msa/ammin/TOC/abstracts/1997_Abstracts/MJ97_Abstracts/Jambor_p620_97.pdf }}</ref>
}}
'''Fettelite''', also known as sanguinite, is a mercury-[sulfosalt mineral](/source/sulfosalt_mineral) with the chemical formula Ag<sub>16</sub>HgAs<sub>4</sub>S<sub>15</sub>. The mineral was first described by Wang and Paniagua (1996)<ref>Wang, N. and Paniagua, A. (1996) Fettelite, a new Hg-sulfosalt mineral from Odenwald. Neues Jahrbuch für Mineralogie Monatshefte, 82, 313–320.</ref> who named it after M. Fettel, a German field geologist who collected the first samples from [Odenwald](/source/Odenwald).<ref name=Bindi>{{Cite journal |last1=Bindi |first1=Luca |last2=Keutsch |first2=Frank N. |last3=Francis |first3=Carl A. |last4=Menchetti |first4=Silvio |year=2009 |journal=American Mineralogist |title=Fettelite, {Ag<sub>6</sub>As<sub>2</sub>S<sub>7</sub>}{Ag<sub>10</sub>HgAs<sub>2</sub>S<sub>8</sub>} from Chañarcillo, Chile: Crystal structure, pseudosymmetry, twinning, and revised chemical formula |volume=94 |pages=609–615 |url=http://www.minsocam.org/msa/ammin/TOC/Abstracts/2009_Abstracts/Apr09_Abstracts/Bindi_p609_09.pdf |doi=10.2138/am.2009.3096|s2cid=53975716 }}</ref> It was first collected in the Nieder-Beerbach mine, 10&nbsp;km south of [Darmstadt](/source/Darmstadt), [Odenwald](/source/Odenwald), [Germany](/source/Germany). Its normal occurrence is in [hydrothermal vein](/source/hydrothermal_vein)s, which can cut [gabbro](/source/gabbro)-[diorite](/source/diorite) [intrusive](/source/Intrusive_rock)s. It is closely related to other rare minerals like [dervillite](/source/dervillite), [daomanite](/source/daomanite), [vaughanite](/source/vaughanite) and [criddleite](/source/criddleite) which are also found in the same type locality as fettelite.<ref name=Jambor/>

Fettelite occurs as clusters of hexagonal flakes. These flakes can get up to 0.2 mm across and around 5-10 μm thick. In more complex hexagonal tablets, somewhat larger sub parallel aggregates can be measured.<ref> Mandarino, J.A (1997) Abstracts of new mineral description The Mineralogical Record, 28, 141-143. </ref>  The birefringence of Fettelite is moderate white to grayish brown.<ref name=Bindi/>

==References==
{{Reflist}}

Category:Arsenic minerals
Category:Mercury(II) minerals
Category:Silver minerals
Category:Sulfosalt minerals
Category:Monoclinic minerals
Category:Minerals in space group 5
Category:Minerals described in 1996

{{sulfide-mineral-stub}}

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