Halotrichite, an iron aluminum sulfate hydrate mineral, was first noted from Sterling Hill by Ewald Gerstmann and was identified using X-ray methods; no chemical or physical data exist. It occurs as small, 1 mm, white, fibrous crystals on pyrite, calcite, and goethite. It is not known from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Formula: FeAl2(SO4)4 · 22H2O
 Essential Elements: Aluminum, Hydrogen, Iron, Oxygen, Sulfur
 All Elements in Formula: Aluminum, Hydrogen, Iron, Oxygen, Sulfur
 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   Halotrichite

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.634

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