# Loellingite

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> Source: https://en.wikipedia.org/wiki/Loellingite
> Source revision: 1196876549
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{{Short description|Iron arsenide mineral}}
{{Infobox mineral
| name        = Loellingite
| boxwidth    = 
| boxbgcolor  = 
| image       = Lollingite-177962.jpg
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| alt         = 
| caption     = Sharp, lustrous loellingite (and/or [arsenopyrite](/source/arsenopyrite)) crystals to 4 mm on [gossan](/source/gossan) matrix. Locality: [Broken Hill Ore Deposit](/source/Broken_Hill_Ore_Deposit), [New South Wales](/source/New_South_Wales), Australia. Size: 2.4 × 2.2 × 2.0 cm.
| category    = Arsenide mineral
| formula     = FeAs<sub>2</sub>
| IMAsymbol   = Lö<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.EB.15a
| dana        = 
| system      = [Orthorhombic](/source/Orthorhombic)
| class       = Dipyramidal (mmm) <br/>[H-M symbol](/source/H-M_symbol): (2/m 2/m 2/m)
| symmetry    = ''Pnnm''
| unit cell   = a = 5.16, b = 5.93 <br/>c = 3.05&nbsp;[Å]; Z&nbsp;=&nbsp;2
| color       = Steel grey to silvery white
| colour      = 
| habit       = Prismatic to pyramidal crystals, massive
| twinning    = On {001}, possibly trillings, polysynthetic on {101}
| cleavage    = Rare, distinct on {010}, {101}
| fracture    = Uneven
| tenacity    = 
| mohs        = 5–5.5
| luster      = Metallic
| streak      = Grayish black
| diaphaneity = 
| gravity     = 7.1–7.5
| density     = 
| polish      = 
| opticalprop = Distinctly anisotropic in reflected light
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| length fast/slow =
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| references  = <ref name=Mindat>[http://www.mindat.org/min-2426.html Mindat]</ref><ref name=Webmin>[http://webmineral.com/data/Lollingite.shtml Webmineral]</ref><ref name=HBM>[http://rruff.geo.arizona.edu/doclib/hom/lollingite.pdf Handbook of Mineralogy]</ref>
}}
'''Loellingite''', also spelled '''löllingite''', is an [iron](/source/iron) [arsenide mineral](/source/arsenide_mineral) with formula FeAs<sub>2</sub>. It is often found associated with [arsenopyrite](/source/arsenopyrite) (FeAsS) from which it is hard to distinguish. [Cobalt](/source/Cobalt), [nickel](/source/nickel) and [sulfur](/source/sulfur) substitute in the structure. The [orthorhombic](/source/orthorhombic) lollingite group includes the [nickel](/source/nickel) iron arsenide [rammelsbergite](/source/rammelsbergite) and the cobalt iron arsenide [safflorite](/source/safflorite). '''Leucopyrite''' is an old synonym for loellingite.

It forms opaque silvery white [orthorhombic](/source/orthorhombic) prismatic crystals often exhibiting [crystal twinning](/source/crystal_twinning). It also occurs in anhedral masses and tarnishes on exposure to air. It has a [Mohs hardness](/source/Mohs_hardness) of 5.5 to 6 and a quite high [specific gravity](/source/specific_gravity) of 7.1 to 7.5. It becomes magnetic after heating.

Loellingite was first described in 1845 at the Lölling district in [Carinthia](/source/Carinthia_(state)), [Austria](/source/Austria), for which it was named.

It occurs in mesothermal [ore deposit](/source/ore_deposit)s associated with skutterudite, native bismuth, [nickeline](/source/nickeline), nickel-skutterudite, [siderite](/source/siderite) and [calcite](/source/calcite). It has also been reported from [pegmatite](/source/pegmatite)s.<ref name=HBM/>

thumb|left|Loellingite from Franklin-Sterling (size: 10.4 × 7.0 × 6.8 cm)

{{Clear}}

==References==
{{Reflist}}

==Further reading==
* {{Cite book |first=Walter |last=Schumann |series=BLV Bestimmungsbuch |title=Mineralien aus aller Welt |edition=2 |year=1991 |isbn=3-405-14003-X |pages=223 }}

==External links==
{{Commons category|Löllingite}}
*[https://web.archive.org/web/20051105235547/http://mineral.galleries.com/minerals/sulfides/lollingi/lollingi.htm Mineral galleries]
*[https://web.archive.org/web/20051102125232/http://simplethinking.com/palache/lollingite.stm Minerals of Franklin, N.J.]

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{{DEFAULTSORT:Lollingite}}
Category:Iron minerals
Category:Arsenide minerals
Category:Orthorhombic minerals
Category:Minerals in space group 58

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