Celestine, a strontium sulfate mineral of the barite group, was reported from Franklin by Gordon (1922) and from Sterling Hill by Bauer and Berman (1930). It occurs as light blue, light pink, or colorless crystals, commonly bladed or tabular and up to 7 mm in length.
Most megascopic material is light blue to some degree, albeit faint. Cleavages are good and the luster is vitreous. There is a moderate pale-blue fluorescence in shortwave ultraviolet according to Bostwick (1992). Bauer and Berman reported their Sterling Hill material to be pure in chemical composition.
The original Franklin celestine occurs as 0.5 mm stout crystals in a thick coating with a saccharoidal texture and a high luster; it encrusted vugs in rhodochrosite associated with calcite and franklinite. Additional specimens, up to 10 cm, were subsequently found on the 900 level, 35 feet from the footwall, and are almost entirely celestine, with vein-like and vuggy textures, and composed of 4-7 mm crystals.
Sterling Hill celestine occurs as 4-7 mm, tabular to bladed, light blue crystals in vugs and seams. It has been found on the 1200, 1300, and 1750 levels, associated with a number of minerals. Calcite is commonly present, and the assemblages appear to have been carbonate veins with much recrystallization. An occurrence in a veinlet assemblage associated with wollastonite-bearing rocks was noted by Jenkins (1994). Celestine is in some respects similar to barite, especially in mode of occurrence, but barite is much more abundant at both orebodies. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Year Discovered: 1791
 Formula: SrSO4
 Essential Elements: Oxygen, Strontium, Sulfur
 All Elements in Formula: Oxygen, Strontium, Sulfur
 IMA Status: Approved
Fluorescent Mineral Properties

 Shortwave UV light: Cream, moderate brightness
 Mid wave UV light: Cream, moderate brightness
 Longwave UV light: Cream, moderate brightness
 Additional Information: Fluoresces best shortwave, phosphoresces cream
 To find out more about this mineral at minDat's website, follow this link   Celestine

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.630

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.48

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 57, No. 2 - Fall 2016, pg. 14Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 1, Richard C. Bostwick - Celestine
View IssueV. 35, No. 1 - Spring 1994, pg. 21Geology and Mineralogy of a Veinlet Assemblage Associated With Wollastonite-Bearing Rocks, Sterling Mine, Ogdensburg, New Jersey, Robert E. Jenkins II - Celestite
View IssueV. 33, No. 2 - Fall 1992, pg. 10The Check List of Franklin-Sterling Hill Fluorescent Minerals - Celestine (Fluorescent Info)
View IssueV. 18, No. 1 - March 1977, pg. 7Recent Mineral Occurances at Sterling Hill by Stephen Sanford - Celestite
View IssueV. 18, No. 1 - March 1977, pg. 22The Fluorescent Minerals of Franklin and Sterling Hill, NJ by Richard C. Bostwick - Celestite
View IssueV. 7, No. 2 - August 1966, pg. 7The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Celestite
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