Fraipontite, a zinc aluminum silicate hydroxide mineral of the clay group, was described from Sterling Hill by Cianciulli (1995a) as 1 mm clusters of 0.1 mm, yellow-to-brown, flattened crystals with pearly luster, on a slip surface in franklinite-willemite-calcite ore apparently from the 340 level. Semi-quantitative microprobe analysis by [Dunn] yielded approximate metal ratios for Zn:Mg:Fe:Mn = 66:27:5:2. Fraipontite has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
 Mineral Note: Zinalsite, discredited by IMA in 2006 is a synonym of fraipontite.
 Year Discovered: 1927
 Formula: (Zn,Al)3((Si,Al)2O5)(OH)4
 Essential Elements: Hydrogen, Oxygen, Silicon, Zinc
 All Elements in Formula: Aluminum, Hydrogen, Oxygen, Silicon, Zinc
 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   Fraipontite

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.486

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 36, No. 1 - Spring 1995, pg. 27Fraipontite From Sterling Hill, New Jersey (small article)
No Images at this time.


All content including, but not limited to, mineral images, maps, graphics, and text on the Franklin-Ogdensburg Mineralogical Society, Inc. (FOMS) website is licensed under a
Creative Commons Attribution-NonCommercial 4.0 International License.
Creative Commons License