Parasymplesite, an iron arsenate hydrate mineral, occurs associated with koettigite on the 340 level at Sterling Hill. It occurs as gray to grayish-blue prismatic crystals, very similar in habit and appearance to its Zn-analogue, koettigite, which is, however, much more abundant locally. Parasymplesite was verified employing X-ray methods and chemical analyses. The one verified specimen has Fe:Zn:Mn = 50:37:13. Both chemical and X-ray methods are suggested for verification. Parasymplesite is likely quite rare, but few specimens of the koettigite-parasymplesite series have been analyzed. It is locally replaced by yukonite, and it has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1954
 Formula: Fe32+(AsO4)2 · 8H2O
 Essential Elements: Arsenic, Hydrogen, Iron, Oxygen
 All Elements in Formula: Arsenic, Hydrogen, Iron, 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   Parasymplesite

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.676

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