Alteration or Mineralization along fractures
Fractures provide conduits for fluid flow so we find a variety of alteration and mineralization products along them.  Mineralized fractures may contain fibers which track the opening of the fracture.  Click here to see those.

Alteration along fractures.  Granodiorite, Sierra Nevada, California.

Fracture-controlled Liesegang banding in siltstone.

Conjugate set of sigmoidal extension fractures.  Filled with Calcite--in limestone.
to see calcite fibers, click here.

Back to Slide Index