Guérinite, a calcium arsenate hydrate mineral, was described by [Dunn] (The Picking Table, 22, #1, p.2) from Sterling Hill, where it occurs as a post-mining mineral in shafts over 30 years old. Guérinite occurs as opaque, white, pearly-lustered aggregates of 1-3 mm prismatic crystals. It was identified using X-ray methods, which are suggested for verification. Guérinite fluoresces with a weak white color in shortwave and longwave ultraviolet (Bostwick, 1982). It formed on white calcite which contained small amounts of arsenopyrite, realgar, and graphite. It is not known from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Formula: Ca5(AsO4)2(HAsO4)2 · 9H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Oxygen
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Oxygen
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Fluorescent Mineral Properties

 Shortwave UV light: Pale yellow
 Mid wave UV light: Pale yellow
 Longwave UV light: Pale yellow
 Additional Information: Phosphoresces pale yellow
 To find out more about this mineral at minDat's website, follow this link   Guérinite

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.668

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 57, No. 2 - Fall 2016, pg. 19Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 1, Richard C. Bostwick - Guérinite
View IssueV. 33, No. 2 - Fall 1992, pg. 10The Check List of Franklin-Sterling Hill Fluorescent Minerals - Guerinite (Fluorescent Info)
View IssueV. 22, No. 1 - March 1981, pg. 2Guerinite and Hawleyite from Sterling Hill, Pete J. Dunn, Guerinite
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