Synadelphite, a manganese arsenate arsenate hydroxide hydrate mineral, was first noted from Sterling Hill by Moore and Ito (1978). It occurs as dark brown fascicles (2-3 mm) of distorted crystals, intimately associated with kraisslite and allactite on a slip surface in the ore. It is best verified using X-ray methods. Synadelphite has not been reported from Franklin, and it is a very rare mineral locally. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1884
 Formula: Mn92+(As5+O4)2(As3+O3)(OH)9 · 2H2O
 Essential Elements: Arsenic, Hydrogen, Manganese, Oxygen
 All Elements in Formula: Arsenic, Hydrogen, Manganese, 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   Synadelphite

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.683

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 37, No. 1 - Spring 1996, pg. 19Closest-Packed Mineral Structures of Franklin-Ogdensburg: Kepler's Gift of the Snowflake, Part two of two parts, Paul B. Moore - Synadelphite
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