GUÉRINITE

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

References:

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

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