MONOHYDROCALCITE

Monohydrocalcite, a calcium carbonate hydrate mineral, was reported by Dunn (1979c) from Sterling Hill; it has not been found at Franklin. It occurs as light green to light yellow-green rounded masses up to several cm in size (resembling drippings) with an internal fibrous texture, encrusting calcite. It resembles hyalite opal at first glance.
Monohydrocalcite was verified using X-ray powder diffraction methods and microprobe analysis which showed only Ca, with no Mg, Fe, Mn, or Zn present in detectable amounts. It is fluorescent in longwave and shortwave ultraviolet with a green color. It is a post-mining mineral which occurs as a dripstone on the walls of adits and shafts.
A second occurrence was reported from Sterling Hill by Jenkins (1994) who described it as white, microbotryoidal crusts on calcite and epidote. (Dunn, 1995)

Location Found:

Ogdensburg

Year Discovered:

1959

Formula:

CaCO₃ · H₂O

Essential Elements:

Calcium, Carbon, Hydrogen, Oxygen

All Elements in Formula:

Calcium, Carbon, Hydrogen, Oxygen

IMA Status:

Approved 1964

Fluorescent Mineral Properties

Shortwave UV light:

Green, moderately bright

Additional Information:

Phosphoresces white

To find out more about this mineral at minDat's website, follow this link Monohydrocalcite

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.622

The Picking Table References

	PT Issue and Page	Description / Comment
View Issue	V. 58, No. 1 - Spring 2017, pg. 13	Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 2, Richard C. Bostwick - Monohydrocalcite
View Issue	V. 35, No. 1 - Spring 1994, pg. 21	Geology and Mineralogy of a Veinlet Assemblage Associated With Wollastonite-Bearing Rocks, Sterling Mine, Ogdensburg, New Jersey, Robert E. Jenkins II - Monohydrocalcite
View Issue	V. 33, No. 2 - Fall 1992, pg. 11	The Check List of Franklin-Sterling Hill Fluorescent Minerals - Monohydrocalcite (Fluorescent Info)
View Issue	V. 20, No. 2 - September 1979, pg. 7	Contributions to the Mineralogy of Franklin and Sterling Hill New Jersey, Monohydrocalcite (small article)

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