Location Found: Franklin and Ogdensburg (Type Locality)
 Year Discovered: 1875
 Formula: (Zn,Fe,Mn)Mn3O7 · 3H2O
 Essential Elements: Hydrogen, Manganese, Oxygen, Zinc
 All Elements in Formula: Hydrogen, Iron, Manganese, Oxygen, Zinc
 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   Chalcophanite

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.586

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.49

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 36, No. 2 - Fall 1995, pg. 27Closest-Packed Mineral Structures of Franklin-Ogdensburg: Kepler's Gift of the Snowflake, Part one of two parts, Paul B. Moore - Chalcophanite
View IssueV. 30, No. 1 - Spring 1989, pg. 17Research Reports, Chalcophanite
View IssueV. 14, No. 1 - February 1973, pg. 10Mineral Notes - Chalcophanite (small article)
View IssueV. 9, No. 1 - February 1968, pg. 11The Exclusive Minerals of Franklin/Ogdensburg, N.J. (as of January 1968) by Frank Z. Edwards - Chalcophanite
View IssueV. 7, No. 2 - August 1966, pg. 7The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Chalcophanite (small article)

Chalcophanite on weathered ore from the mud zone, Sterling Hill Mine, NJ.
Chalcophanite (black spherical / radial aggregates) on weathered ore from the mud zone, Sterling Hill Mine, NJ. Photo by JVF.

Chalcophanite from the Sterling Hill Mine, Ogdensburg, NJ
Chalcophanite (black to dark gray spherical aggregates) from the Sterling Hill Mine, Ogdensburg, NJ. Field of view 1". From the collection of, and photo by WP.

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