Heptasartorite

{{Short description|Very rare mineral}}

{{Infobox mineral

| name = Heptasartorite

| category = Sulfosalt

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| formula = Tl₇Pb₂₂As₅₅S₁₀₈

| IMAsymbol = Hsat{{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 = Monoclinic

| class = Prismatic (2/m)
(same H-M symbol)

| symmetry = P2₁/c

| unit cell = a = 37.62, b = 7.88,
c = 20.07 [Å], β = 101.93° (approximated)

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Heptasartorite is a very rare mineral{{cite web|url=http://www.mindat.org/min-46890.html |title=Heptasartorite: Heptasartorite mineral information and data |website=Mindat.org |accessdate=2016-03-04}} with formula Tl₇Pb₂₂As₅₅S₁₀₈. It belongs to sartorite homologous series.Topa, D., Stroeger, B., Makovicky, E., Berlepsch, P., and Stanley, C., 2015. Heptasartorite, IMA 2015-073. CNMNC Newsletter No. 28, December 2015, 1861; Mineralogical Magazine 79, 1859–1864 It is related to other recently approved minerals of the series: enneasartorite and hendekasartorite.{{cite web|url=http://www.mindat.org/min-46892.html |title=Enneasartorite: Enneasartorite mineral information and data |website=Mindat.org |accessdate=2016-03-10}}{{cite web|url=http://www.mindat.org/min-46894.html |title=Hendekasartorite: Hendekasartorite mineral information and data |website=Mindat.org |accessdate=2016-03-10}} All three minerals come from a quarry in Lengenbach, Switzerland, which is famous of thallium minerals.{{cite web|url=http://www.mindat.org/loc-3207.html |title=Lengenbach Quarry, Fäld (Imfeld; Im Feld; Feld), Binn Valley, Wallis (Valais), Switzerland - Mindat.org |website=Mindat.org |accessdate=2016-03-10}} Chemically similar minerals include edenharterite and hutchinsonite.{{cite web|url=http://www.mindat.org/min-1350.html |title=Edenharterite: Edenharterite mineral information and data |website=Mindat.org |accessdate=2016-03-10}}{{cite web|url=http://www.mindat.org/min-1954.html |title=Hutchinsonite: Hutchinsonite mineral information and data |website=Mindat.org |accessdate=2016-03-10}}