Location Found: Ogdensburg
 Formula: (Na,Ca)0.5(Mn4+,Mn3+)2O4 · 1.5H2O
 Essential Elements: Hydrogen, Manganese, Oxygen, Sodium
 All Elements in Formula: Calcium, Hydrogen, Manganese, Oxygen, Sodium
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
 To find out more about this mineral at minDat's website, follow this link   Birnessite

Dunn, Pete J. (1995). Franklin and Sterling Hill New Jersey: the world's most magnificent mineral deposits. Franklin, NJ.: The Franklin-Ogdensburg Mineralogical Society. p.584

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.45

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 2, No. 1 - February 1961, pg. 4Birnessite (small article)

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

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