Hexahydrite, a magnesium sulfate hydrate mineral, was identified by [Dunn] as a white powdery efflorescence associated with mcallisterite on franklinite/willemite ore from Sterling Hill. It was identified using X-ray diffraction methods, and no physical or chemical measurements have been made. It has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1911
 Formula: MgSO4 · 6H2O
 Essential Elements: Hydrogen, Magnesium, Oxygen, Sulfur
 All Elements in Formula: Hydrogen, Magnesium, Oxygen, Sulfur
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Fluorescent Mineral Properties

 Shortwave UV light: White, moderate to weak intensity
 Mid wave UV light: White, moderate to weak intensity
 Longwave UV light: White, moderate to weak intensity
 Additional Information: Phosphoresces white, moderate to weak intensity
 To find out more about this mineral at minDat's website, follow this link   Hexahydrite

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.635

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.61

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 57, No. 2 - Fall 2016, pg. 20Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 1, Richard C. Bostwick - Hexahydrite
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