cylindrite

from The Century Dictionary.

• noun A sulphid of lead, antimony, and tin, occurring in massive forms with concentric cylindrical structure: found in Bolivia. Also written kylindrite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A sulfosalt mineral, containing tin, lead, antimony and iron, whose triclinic pinacoidal crystals often occur as tubes or cylinders.