Cylindrite

{{Infobox mineral

| name = Cylindrite

| boxwidth =

| boxbgcolor =

| image = Cylindrite - San Francisco Mine, Poopó town, Oruro Department, Bolivia.JPG

| imagesize = 260px

| alt =

| caption =

| category = Sulfosalt minerals

| formula = Pb₃Sn₄FeSb₂S₁₄

| IMAsymbol=Cy{{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 = 1,844.71 g/mol

| strunz = 2.HF.25a

| dana = 03.01.04.01

| system = Triclinic

| symmetry =

| unit cell =

| color =

| colour = Lead grey, greyish black

| habit = Cylindrical

| twinning =

| cleavage = Perfect on {100}

| fracture =

| tenacity = Malleable

| mohs = {{frac|2|1|2}}

| lustre = Metallic

| streak = Black

| diaphaneity = Opaque

| gravity = 5.4 – 5.42

| density =

| polish =

| opticalprop =

| refractive =

| birefringence =

| pleochroism =

| 2V =

| dispersion =

| extinction =

| length fast/slow =

| fluorescence =

| absorption =

| melt =

| fusibility =

| diagnostic =

| solubility =

| impurities =

| alteration =

| other =

| prop1 =

| prop1text =

| references = {{Cite web |url=http://mineral.galleries.com/minerals/sulfides/cylindri/cylindri.htm |title=Mineral galleries |access-date=2006-01-18 |archive-url=https://web.archive.org/web/20060111073838/http://mineral.galleries.com/minerals/sulfides/cylindri/cylindri.htm |archive-date=2006-01-11 |url-status=dead }}{{cite web|url=http://webmineral.com/data/Cylindrite.shtml |title=Cylindrite Mineral Data |publisher=webmineral.com|accessdate=2015-11-24}}{{cite web|url=http://www.mindat.org/min-1204.html |title=Cylindrite: Cylindrite mineral information and data|publisher=mindat.org|accessdate=2015-11-24}}

}}

Cylindrite is a sulfosalt mineral containing tin, lead, antimony and iron with formula: Pb₃Sn₄FeSb₂S₁₄. It forms triclinic pinacoidal crystals which often occur as tubes or cylinders which are in fact rolled sheets. It has a black to lead grey metallic colour with a Mohs hardness of 2 to 3 and a specific gravity of 5.4.

It was first discovered in the Santa Cruz mine, Oruro Department, Bolivia in 1893. The name arises from its curious cylindrical crystal which it forms almost uniquely among minerals.