Clausthalite

{{Infobox mineral

| name = Clausthalite

| category = Selenide mineral

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| image = Clausthalite-207330.jpg

| imagesize = 260px

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| formula = PbSe

| IMAsymbol = Cth{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|url=https://www.cambridge.org/core/journals/mineralogical-magazine/article/imacnmnc-approved-mineral-symbols/62311F45ED37831D78603C6E6B25EE0A|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}}

| molweight =

| strunz = 2.CD.10

| dana = 02.08.01.02

| system = Isometric

| class = Hexoctahedral (m{{overline|3}}m)
H-M symbol: (4/m {{overline|3}} 2/m)

| symmetry = Fm{{overline|3}}m

| color = Bluish gray to lead-gray

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| habit = Massive to granular with euhedral crystals

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| cleavage = {001} Perfect, {010} Perfect, {100} Perfect

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| mohs = 2.5

| luster = Metallic

| streak = grayish black

| diaphaneity = opaque

| gravity = 7.6–8.8

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| references = [https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Clausthalite Mineralienatlas]http://rruff.geo.arizona.edu/doclib/hom/clausthalite.pdf Handbook of Mineralogyhttp://webmineral.com/data/Clausthalite.shtml Webmineral datahttp://www.mindat.org/min-1061.html Mindat

}}

Clausthalite is a lead selenide mineral, PbSe. It forms a solid solution series with galena PbS.