phlebolite

from The Collaborative International Dictionary of English v.0.48

Phlebolite \Phleb"o*lite\, Phlebolith \Phleb"o*lith\, n. [Gr. ?,
   ?, a vein + -lite, -lith.] (Med.)
   A small calcareous concretion formed in a vein; a vein stone.
   [1913 Webster]