Boulder with slickenside markings in a quarry near Tucson.
Slickensides are created by friction and pressure at the fault lines of the earth's crust as immense plates of rock slowly grind past one another, leaving distinctive parallel grooves.
Here is a fault with slickensiding, dipping at a steep angle down into the earth.
A boulder section with beautiful, well-defined slickensiding.
Close-up of the slickenside grooves.
These faults also create space for the growth of secondary minerals ...
.. which often have potential for fluorescence.
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