# Polybasite

> Mediated Wiki article. Canonical URL: https://mediated.wiki/source/Polybasite
> Markdown URL: https://mediated.wiki/source/Polybasite.md
> Source: https://en.wikipedia.org/wiki/Polybasite
> Source revision: 1343112934
> License: Creative Commons Attribution-ShareAlike 4.0 International (https://creativecommons.org/licenses/by-sa/4.0/)

{{Short description|Mineral}}
{{Infobox mineral
| name        = Polybasite
| boxwidth    = 
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| image       = Polybasite-37890.jpg
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| alt         = 
| caption     = 
| category    = [Sulfosalt minerals](/source/Sulfosalt_minerals)
| formula     = {{chem2|[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]}}
| IMAsymbol   = Plb<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.GB.15
| dana        = 
| system      = [Monoclinic](/source/Monoclinic) and [trigonal](/source/trigonal) polytypes
| class       = Prismatic (2/m) <br/><small>(same [H-M symbol](/source/H-M_symbol))</small>
| symmetry    = ''C2/c''
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| color       = 
| colour      = steel black
| habit       = 
| twinning    = 
| cleavage    = poor on (001)
| fracture    = uneven
| tenacity    = 
| mohs        = 1.5–2
| lustre      = metallic, adamantine or glimmering
| streak      = black with reddish tint
| diaphaneity = 
| gravity     = 6–6.2
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| references  = <ref>[http://www.mindat.org/min-3256.html Polybasite: mindat.org]</ref><ref>[http://www.webmineral.com/data/Polybasite.shtml Webmineral.com]</ref><ref>{{Cite web |url=http://www.handbookofmineralogy.com/pdfs/polybasite.pdf |title=Handbook of Mineralogy |access-date=2011-05-16 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303171441/http://www.handbookofmineralogy.com/pdfs/polybasite.pdf |url-status=dead }}</ref><ref>{{cite book|title=Minerals of the World|year=1990|isbn=0-517-68030-0|author=Rudolf Dǔd'a and Luboš Rejl|publisher=Arch Cape Press|page=40}}</ref>
}}

'''Polybasite''' is a [sulfosalt](/source/sulfosalt) mineral of [silver](/source/silver), [copper](/source/copper), [antimony](/source/antimony) and [arsenic](/source/arsenic). Its chemical formula is {{chem2|[(Ag,Cu)6(Sb,As)2S7][Ag9CuS4]}}.

It forms black [monoclinic](/source/Monoclinic_crystal_system) crystals (thin, tabular, with six corners) which can show dark red internal reflections. It has a [Mohs hardness](/source/Mohs_hardness) of 2.5 to 3. It is found worldwide and is an [ore](/source/ore) of silver. The name comes from the number of base metals in the mineral.

== Images ==
<gallery widths="140px" heights="130px">
File:Polybasite-tmu16a.jpg|Unusual polybasite specimen from Mayo Mining District, [Yukon Territory](/source/Yukon_Territory), Canada.
</gallery>

== References ==

{{Reflist}}
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{{commons category|Polybasite}}
 
Category:Silver minerals
Category:Copper(I) minerals
Category:Antimony minerals
Category:Arsenic minerals
Category:Sulfosalt minerals
Category:Monoclinic minerals
Category:Minerals in space group 15
Category:Glances
Category:Minerals described in 1829

{{Sulfide-mineral-stub}}

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