Ogdensburgite is a calcium zinc ferric-iron arsenate hydroxide hydrate mineral. In a microprobe analysis the water content was shown to be 14.8 wt. % by Kampf and Dunn (1987), who also provided the formula.
Ogdensburgite was first described from Sterling Hill by Dunn (1981d) and was redefined on the basis of better quality material from Mapimi, Durango, Mexico, by Kampf and Dunn (1987).
Sterling Hill ogdensburgite occurs as a thin dark orange-red to brown crust of platy crystals perfect cleavage normal to the surface of the crusts. The dark color is the result of alteration; fresh material has a very bright reddish-orange color. The hardness is approximately 2, and the density is likely close to 3.11 g/cm3, rather than the value of 2.92 g/cm3 reported by Dunn (1981d). X-ray methods are best for verification.
Ogdensburgite was found near the 340 level at Sterling Hill as crusts, botryoidal knobs, and protuberances coating low-grade black-willemite ore. It is associated with koettigite, adamite, yukonite, legrandite, pharmacosiderite, and other arsenates. It may have been locally abundant, but in the 1980's many specimens of other minerals were sold mislabeled as ogdensburgite. (Dunn, 1995)

 Location Found: Ogdensburg (Type Locality)
 Year Discovered: 1980
 Formula: Ca2Fe43+(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Iron, Oxygen, Zinc
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Iron, Manganese, Oxygen, Zinc
 IMA Status: Approved 1980
 To find out more about this mineral at minDat's website, follow this link   Ogdensburgite

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.675

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 23, No. 1 - Spring 1982, pg. 7Mineral Notes Research Reports, Ogdensburgite
View IssueV. 22, No. 2 - September 1981, pg. 5Mineral Notes A Mineral New To Science, Ogdensburgite

Ogdensburgite, parasymplesite, calcite and minor franklinite, Sterling Hill Mine, Ogdensburg, NJ
Ogdensburgite (light to dark brown), parasymplesite (gray-blue sprays), calcite (white) and minor franklinite (black) from Sterling Hill Mine, Ogdensburg, NJ. 2 1/2" x 1 3/4". From the collection of, and photo by Robert A. Boymistruk.

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