Limestone cut by crystal-fiber calcite vein and minute crack-seal veins, northern Appalachians, Vermont


I found this rock on a little island near Lone Rock Point near Burlington, Vermont, in 1991.  On that day (a sunny afternoon) I was canoeing with a friend, Drew Ives.   Of course I gave Drew (trained as a lawyer) a lecture on pressure solution.  I like the fact that this one specimen displays pressure solution, tiny crack-seal veins, and a thick vein (once a tiny crack-seal vein) that ‘took off,’ growing in ways that created crystal fibers tracking the opening process.  

Age & Formation
Limestone (and dolomite) of Cambrian age, ~520 Ma.