Crenulations   CRENULATIONS
Mount Abraham Mica-Schist
Addison County, Vermont

The ridges and valleys running from the upper right to the lower left of this photograph are little wrinkles called crenulations. These small folds of the planar fabric look like corrugated cardboard. The early fabric here is made up of plates of mica (muscovite and paragonite) and long, opaque ilmenite crystals. Find an ilmenite crystal that is bent around a crenulation. Straighten it out in your imagination and estimate how much this rock was shortened folding.

Crossed polarizers

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