Epsomite, a magnesium sulfate hydrate mineral, was reported from Sterling Hill by Cook (1973) as a white, 1/8 inch-thick efflorescence on fracture surfaces in gneiss. It has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Year Discovered: 1806
 Formula: MgSO4 · 7H2O
 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

 Mid wave UV light: Violet
 Longwave UV light: Cream
 To find out more about this mineral at minDat's website, follow this link   Epsomite

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.633

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.55

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 57, No. 2 - Fall 2016, pg. 17Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 1, Richard C. Bostwick - Epsomite
View IssueV. 33, No. 2 - Fall 1992, pg. 10The Check List of Franklin-Sterling Hill Fluorescent Minerals - Epsomite (Fluorescent Info)
View IssueV. 18, No. 1 - March 1977, pg. 24The Fluorescent Minerals of Franklin and Sterling Hill, NJ by Richard C. Bostwick - Epsomite
View IssueV. 13, No. 1 - February 1972, pg. 8Franklin Mineral Notes - Epsomite (small article)
View IssueV. 12, No. 2 - August 1971, pg. 7New Minerals for Franklin-Sterling Validated List - Epsomite (small article)
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