Wednesday, August 6, 2014

Geo 730: August 6, Day 583: Calcite

The white calcite veins don't stand out well against the light clays of the altered volcaniclastic rocks, so I've highlighted a few patches below.
There's one large vein here, but myriads of smaller ones, ranging from a couple millimeters to maybe a centimeter or two. The calcite was emplaced into what appear to be faults; many show casts of slickensides. However, the rock itself is too rotted to be able to identify offsets or slicks in place. Only the mineralization hints at their existence.

Photo unaltered. August 5, 2012. FlashEarth location.

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