Jarosewichite is a manganese arsenate hydroxide mineral related to chlorophoenicite. Jarosewichite occurs in barrel-shaped, prismatic crystals with a rough irregular surface; they resemble some Sterling Hill synadelphite. Such crystals form slightly radial aggregates. Crystals are 0.5-1.0 mm in length. Jarosewichite is very dark red, nearly black to the eye, with subvitreous luster, a density of 3.66 g/cm3, and an apparent lack of cleavage. It is best verified using X-ray methods. Additional descriptive information was provided by King (1993). The matrix is vuggy ore consisting of massive green andradite and manganoan franklinite. The vugs are lined with a poorly crystalline friedelite-like mineral, which is in turn partially encrusted with hausmannite and coated cahnite crystals. These minerals are, in turn, coated partially with crystals of flinkite and jarosewichite. (Dunn, 1995)

 Location Found: Franklin (Type Locality), unique to Franklin/Ogdensburg area
 Year Discovered: 1982
 Formula: Mn32+Mn3+(AsO4)(OH)6
 Essential Elements: Arsenic, Hydrogen, Manganese, Oxygen
 All Elements in Formula: Arsenic, Hydrogen, Manganese, Oxygen
 IMA Status: Approved
 To find out more about this mineral at minDat's website, follow this link   Jarosewichite

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.669

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 34, No. 1 - Spring 1993, pg. 11The Flinkite / Cahnite / Jarosewichite Assemblage From Franklin, New Jersey, Vandall T. King - Jarosewichite
View IssueV. 24, No. 1 - Spring 1983, pg. 13Mineral Notes Research Reports, Jarosewichite
View IssueV. 23, No. 1 - Spring 1982, pg. 7Mineral Notes A Mineral New To Science, Jarosewichite
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