wassonite

{{infobox mineral

| name = Wassonite

| category = Sulfide mineral

| formula = TiS

| IMAsymbol = Was{{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}}

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| system = Trigonal

| class = Hexagonal scalenohedral ({{Overline|3}}m)
H-M symbol: ({{Overline|3}} 2/m)

| symmetry = R{{Overline|3}}m

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| references = [http://www.mindat.org/min-40551.html Mindat.org][https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Wassonite Mineralienatlas]

}}

Wassonite is a scarce titanium sulfide mineral with the chemical formula TiS.{{cite web|title=Scientists Find New Type Of Mineral In Historic Meteorite|url=http://www.nasa.gov/home/hqnews/2011/apr/HQ_11-098_New_Mineral.html|publisher=NASA|accessdate=2011-04-07|author1=Dwayne C. Brown |author2=William Jeffs |date=2011-04-05}} Its discovery was announced in a 2011 NASA press release as a single small grain within an enstatite chondrite meteorite called "Yamato 691", which was found during a 1969 Japanese expedition to Antarctica.{{cite web|last=Bryner|first=Jeanna|title=4.5-Billion-Year-Old Antarctic Meteorite Yields New Mineral|url=http://www.livescience.com/13581-antarctic-meteorite-mineral-wassonite.html|publisher=LiveScience|accessdate=2011-04-07|date=2011-04-06}} This grain represents the first observation in nature of the synthetic compound titanium(II) sulfide.

The mineral was named after John T. Wasson, a professor at the University of California, Los Angeles and was approved by the International Mineralogical Association.{{cite web |title=Scientists Find New Type of Mineral in Historic Meteorite |url=https://www.sciencedaily.com/releases/2011/04/110405151612.htm |publisher=Science Daily |accessdate=2011-04-07 |date=2011-04-05 }}{{Cite journal |author=Nakamura-Messenger, K., Clemett, S.J., Rubin, A., Choi, B.-G., Keller, L.P., Zhang, S., Rahman, Z. and Oikawa, K. |title=Wassonite, IMA 2010-074 |journal=CNMNC Newsletter |issue=8 |date=April 2011 |page=293}}