21 April 2010


Posted by Callan Bentley

Whilst poking about Sunday on the fine exposures along West Virginia’s new route 55, my structural geology students and I noticed some joint surfaces decorated with pyrolusite dendrites. But I also found a nice slab which had one surface covered with a thicker coat of manganese oxide, and here the habit was botryoidal, like little bunches of grapes. A few photos for you:




Because I don’t care as much for minerals as I do for structures, I donated it to the mineralogy teaching collection at GMU…