Blobiform

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:

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55_04

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

2 Responses

  1. …I don’t care as much for minerals as I do for structures…

    I always knew you were a sensible chap.

  2. could you please e-mail me a more exact location of the Pyrolusite along
    Hwy. 55.

    Thank you

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