Editing Thortveitite

{{Infobox mineral
| name        = Thortveitite
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| image       = Thortveitite-ea14a.jpg
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| alt         = 
| caption     = Thortveitite
| category    = 
| formula     = (Sc,Y)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>
| IMAsymbol   = Tvt<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      = 9.BC.05
| dana        = 
| system      = [[Monoclinic]]
| class       = Prismatic (2/m) <br/><small>(same [[H-M symbol]])</small>
| symmetry    = ''C2/m''
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| mohs        = 5–6
| luster      = vitreous
| streak      = gray
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| gravity     = 3.3–3.8
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}}

'''Thortveitite''' is a rare [[mineral]] consisting of [[scandium]] [[yttrium]] [[silicate]] (Sc,Y)<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>. It is the primary source of [[scandium]].<ref>{{cite web |url=https://www.stanfordmaterials.com/blog/an-overview-of-scandium.html |title=Properties of Scandium |last=Lowen |first=Eric |website=Stanford Advanced Materials |access-date=Sep 24, 2024}}</ref> Occurrence is in granitic [[pegmatite]]s. It was named after [[Olaus Thortveit]], a [[Norway|Norwegian]] engineer. It is grayish-green, black or gray in color.<ref>{{Cite web|title=Thortveitite Mineral Data|url=http://webmineral.com/data/Thortveitite.shtml#.YI_Dr7UzZEY|access-date=2021-05-03|website=webmineral.com}}</ref><ref>{{Cite web|title=Thortveitite|url=https://www.mindat.org/min-3950.html|access-date=2021-05-03|website=www.mindat.org}}</ref><ref>{{Cite journal|last1=Bianchi|first1=Riccardo|last2=Pilati|first2=Tullio|last3=Diella|first3=Valeria|last4=Gramaccioli|first4=Carlo Maria|last5=Mannucci|first5=Gregorio|date=1988-06-01|title=A re-examination of thortveitite|url=https://pubs.geoscienceworld.org/msa/ammin/article-abstract/73/5-6/601/105009/A-re-examination-of-thortveitite|journal=American Mineralogist|language=en|volume=73|issue=5–6|pages=601–607|issn=0003-004X}}</ref><ref>{{Cite book|url=https://www.worldcat.org/oclc/610708490|title=Mineralien aus aller Welt|date=1990|others=Walter Schumann|isbn=978-3-405-14003-8|location=München|oclc=610708490}}</ref>

A transparent gem quality example was found in 2004, and reported in ''The Journal of Gemmology''.<ref>{{Cite journal|last=Chapman, R., Mercer, I.F., Rankin, A.H., Spratt, J.|date=2008|title=Thortveitite – a new gemstone|url=https://gem-a.com/images/Documents/JoG/JoG2009_31_5-8.pdf#page=3|journal=Journal of Gemmology|volume=31|issue=1 |pages=1–6|doi=10.15506/JoG.2008.31.1.1|bibcode=2008JGem...31....1C }}</ref>

==See also==
*[[List of minerals]]
*[[List of minerals named after people]]

==References==
{{Reflist}}
[[Category:Scandium minerals]]
[[Category:Yttrium minerals]]
[[Category:Sorosilicates]]
[[Category:Monoclinic minerals]]
[[Category:Minerals in space group 12]]


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