Sterlinghillite is a manganese arsenate hydrate mineral.
Sterlinghillite was described from Sterling Hill by Dunn (1981a); it has not been found at Franklin. A second specimen of the original assemblage was described by Cianciulli (1995b).
Sterlinghillite occurs in two habits on the type specimen: as soft pearly microscopic crystals which resemble laumontite and as 0.1 mm spherulitic clusters of platy crystals. Sterlinghillite is white to very light pink with one cleavage parallel to the elongation direction. The luster is silky on external crystal faces. The density is 2.95 g/cm3, as measured, but may be low due to the porosity of the aggregate. There is no discernible fluorescence in ultraviolet. It is best verified using X-ray methods.
Sterlinghillite occurs as 0.1 mm clusters on fracture surfaces in franklinite/sphalerite ore, which is in contact with loellingite and calcite. (Dunn, 1995)

 Location Found: Ogdensburg (Type Locality)
 Year Discovered: 1980
 Formula: Mn3(AsO4)2 · 4H2O
 Essential Elements: Arsenic, Hydrogen, Manganese, Oxygen
 All Elements in Formula: Arsenic, Hydrogen, Manganese, Oxygen
 IMA Status: Approved 1980
 To find out more about this mineral at minDat's website, follow this link   Sterlinghillite

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.682

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 36, No. 1 - Spring 1995, pg. 27Sterlinghillite, John Cianciulli
View IssueV. 22, No. 2 - September 1981, pg. 5Mineral Notes Research Reports, Sterlinghillite
View IssueV. 22, No. 1 - March 1981, pg. 3Mineral Notes A Mineral New To Science, Sterlinghillite
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