Arseniosiderite, a calcium ferric-iron arsenate hydroxide hydrate mineral, was first reported by Palache (1935), but this material was shown by Frondel (1972) and Dunn (1979c) to be a Ca-Mn silicate, later described as the new mineral bostwickite (Dunn and Leavens, 1983).
True arseniosiderite was verified from Sterling Hill, using X-ray diffraction methods and a microprobe scan which confirmed Ca, Fe, and As; Mn and Zn are less than 1 wt. % in such material. This arseniosiderite occurred as a light brown to medium brown, microscopic alteration product of franklinite and loellingite in highly calcic ore. It is best verified using X-ray methods. Arseniosiderite is rare and has not been reported from Franklin.
Several arseniosiderite-like unnamed minerals have been found, mostly at Sterling Hill, but they were of too low a quality to permit definition; some may be mixtures. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1842
 Formula: Ca2Fe33+(AsO4)3O2 · 3H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Iron, Oxygen
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Iron, 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   Arseniosiderite

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.658

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 20, No. 2 - September 1979, pg. 5Contributions to the Mineralogy of Franklin and Sterling Hill New Jersey, Arseniosiderite (small article)
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