Anhydrite, a calcium sulfate mineral of the barite group, was first reported from Franklin by Palache (1928a, 1935) as a pale bluish white, granular core of a small 25mm nodule in marble. This anhydrite was bordered by gypsum and, in turn, by sussexite and by serpentine. According to Frondel (1972) it was later found in some abundance. Frondel also reported an occurrence at Sterling Hill as white granular material associated with gypsum in calcite.
Coarsely crystallized anhydrite has three directions of cleavage at right angles, a vitreous luster, and no discernible fluorescence in ultraviolet. A specimen labeled from Franklin has 1 cm crystals associated with calcite, sphalerite, and willemite. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1804
 Formula: CaSO4
 Essential Elements: Calcium, Oxygen, Sulfur
 All Elements in Formula: Calcium, 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   Anhydrite

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.627

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.41

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 7, No. 2 - August 1966, pg. 5The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Anhydrite
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