Birnessite



Birnessite (red to maroon), calcite (white), franklinite (black), and minor willemite (gray) from the Sterling Hill Mine, Ogdensburg, NJ. 2 1/4" x 1 1/4". From the collection of JVF, photo by WP.


Birnessite, calcite, franklinite, and minor willemite, Sterling Hill Mine, Ogdensburg, NJ