Hancockite





 Location Found: Franklin (Type Locality)
     
 Mineral Note: Epidote-(Pb) was the approved name for Hancockite between 2006 and 2015. In July 2015, the IMA approved a proposal by Olav Revheim and Vandall King to revert the approved name to hancockite. Non-fluorescent red-brown mineral, often associated with rare Franklin mineral species.
 Year Discovered: 1899
     
 Formula: {CaPb}{Al2(Fe3+,Mn3+)}(Si2O7)(SiO4)O(OH)
 Essential Elements: Aluminum, Calcium, Hydrogen, Iron, Lead, Oxygen, Silicon
 All Elements in Formula: Aluminum, Calcium, Hydrogen, Iron, Lead, Manganese, Oxygen, Silicon
     
 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   Hancockite

     
 References:
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.405

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.59


The Picking Table References
 PT Issue and PageDescription / Comment
V. 56, No. 2 - Fall 2015, pg. 27Hancockite Reinstated as Species Name, Olav Revheim and Vandall T. King
View IssueV. 47, Combined Issue 2006, pg. 21Hancockite Renamed Epidote-Pb Earl R. Verbeek
View IssueV. 33, No. 1 - Spring 1992, pg. 20The Lead Silicate Minerals of Franklin, New Jersey: an SEM Survey, Herb Yeates, Hancockite
View IssueV. 28, No. 1 - Spring 1987, pg. 25Mineral Notes Research Reports, The Roeblingite Assemblage, Hancockite
View IssueV. 9, No. 1 - February 1968, pg. 13The Exclusive Minerals of Franklin/Ogdensburg, N.J. (as of January 1968) by Frank Z. Edwards - Hancockite
     
Images

     
Hancockite, franklinite, andradite garnet and minor willemite from Franklin, NJ.
Hancockite (red), franklinite (black), andradite garnet (brown) and minor willemite from Franklin, NJ. From the collection of, and photo by JVF.


Hancockite (brick red), franklinite, andradite garnet, willemite and minor hendricksite mica from Franklin, NJ
Hancockite (brick red), franklinite (black), andradite garnet (golden brown), willemite (gemmy aqua green) and minor hendricksite mica (black) from Franklin, NJ. 3 1/2" x 2 3/4". From the collection of, and photo by Robert A. Boymistruk.







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