Annabergite



Annabergite, a nickel arsenate hydrate mineral, was assumed by Koenig (1889) to be present in what was referred to as desaulesite (see pimelite) at Franklin. Palache (1935) considered it to be an unconfirmed species.
Annabergite was subsequently confirmed by the New Jersey Zinc Company (Edwards; The Picking Table, 19, #2, 10) from a find on the Trotter dump in 1971. It is not known from Sterling Hill.
Annabergite occurs as a whitish powdery encrustation on fluorite, associated with pimelite and nickel arsenides from the Trotter Shaft at Franklin. Because annabergite is not unambiguously differentiated from erythrite by X-ray methods alone, the identification is tentative. The Ni end-member is presumed because of the Ni-As dominance in the assemblage (see nickeline, rammelsbergite, etc.). However, the assemblage is Co-rich at its outer extremities where the probable annabergite powder occurs, and thus the unanalyzed material could possibly be nickeloan erythrite. (Dunn, 1995)


 Location Found: Franklin
     
 
 Year Discovered: 1852
     
 Formula: Ni3(AsO4)2 · 8H2O
 Essential Elements: Arsenic, Hydrogen, Nickel, Oxygen
 All Elements in Formula: Arsenic, Hydrogen, Nickel, Oxygen
     
 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   Annabergite

     
 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.657


The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 19, No. 2 - September 1978, pg. 10The Post Palache Minerals by Frank Z. Edwards - Annabergite
View IssueV. 12, No. 1 - February 1971, pg. 7Franklin Mineral Notes - Annabergite (small article)
     
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