Tellurobismuthite

{{infobox mineral

| name = Tellurobismuthite

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| image = Tellurobismuthite-724040.jpg

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| caption = Tellurobismuthite. Locality: Kutemajärvi mine, Orivesi, Western and Inner Finland Region, Finland

| category = Sulfide mineral

| formula = Bi₂Te₃

| IMAsymbol = Tbi{{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}}

| molweight =

| strunz = 2.DC.05

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| system = Trigonal

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

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

| unit cell = a = 4.43, c = 29.91 [Å]; Z = 3

| color = Pale lead-gray; white in polished section

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| habit = Foliated masses and irregular plates

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| cleavage = Perfect on {0001}

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| tenacity = Flexible, sectile

| mohs = 1.5 – 2

| luster = Metallic

| streak = Lead gray

| diaphaneity = Opaque

| gravity = 7.815

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| references = {{mindat|id=3907|title=Tellurobismuthite|date=June 2022}}[http://www.webmineral.com/data/Tellurobismuthite.shtml Tellurobismuthite data on Webmineral]{{cite web |last1=Anthony |first1=John W. |last2=Bideaux |first2=Richard A. |last3=Bladh |first3=Kenneth W. |last4=Nichols |first4=Monte C. |title=Tellurobismuthite |url=http://www.handbookofmineralogy.org/pdfs/tellurobismuthite.pdf |website=Handbook of Mineralogy |publisher=Mineral Data Publishing |access-date=22 June 2022 |date=2005}}

}}

Tellurobismuthite, or tellurbismuth,{{mindat|id=6403|title=Tellurbismuth|date=June 2022}} is a telluride mineral: bismuth telluride (Bi₂Te₃). It crystallizes in the trigonal system. There are natural cleavage planes in the (0001) direction as the crystal is effectively lamellar (layered) in that plane. The Mohs hardness is 1.5 – 2 and the specific gravity is 7.815. It is a dull grey color, which exhibits a splendent luster on fresh cleavage planes.