Wendwilsonite is a calcium magnesium arsenate hydrate mineral and the Mg-analogue of roselite. Even small amounts of cobalt color the mineral intensely.
Wendwilsonite was described by Dunn et al. (1987a) from Sterling Hill. It is rare locally and has not been found at Franklin.
Wendwilsonite is bright pink and occurs as euhedral 0.5 mm crystals with vitreous luster and a perfect cleavage on. The extreme paucity of material precluded the measurement of other physical and optical properties on local material. Both chemical and X-ray methods are required for verification.
Wendwilsonite is known to [Dunn] on but one specimen from Sterling Hill, consisting of manganoan calcite with sparse franklinite and willemite, on which is serpentine coated with calcite. Wendwilsonite is the last mineral to form. (Dunn, 1995)

 Location Found: Ogdensburg (Type Locality)
 Year Discovered: 1985
 Formula: Ca2Mg(AsO4)2 · 2H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Magnesium, Oxygen
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Magnesium, Oxygen
 IMA Status: Approved 1985
 To find out more about this mineral at minDat's website, follow this link   Wendwilsonite

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.685

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 28, No. 2 - Fall 1987, pg. 13New To Science Wendwilsonite (small article)
View IssueV. 28, No. 1 - Spring 1987, pg. 3From the Laboratory, Dr. Pete J. Dunn, John L. Baum, Wendwilsonite
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