YUKONITE



Yukonite, a calcium ferric-iron arsenate hydrate mineral, was identified from Sterling Hill during an investigation of some substances locally referred to as pitticite (Dunn, 1982). It occurred near the 340 level in two habits: as reddish-brown, waxy, gel-like material very similar to pitticite; and as dark brown lath-like aggregates, which have replaced koettigite and/or parasymplesite and which are associated with ogdensburgite and other arsenates.
Microprobe analysis yielded SiO2 0.6, Al2O3 1.0, Fe2O3 28.8, MgO 0.6, CaO 10.4, MnO 2.2, ZnO 3.8, As2O5 39.9, SO3 0.2, H2O (by difference) 12.5, total = 100.0 wt. %. X-ray methods are suggested for verification. Yukonite has not been reported from Franklin. (Dunn, 1995)

 Location Found: Ogdensburg
     
 
 Year Discovered: 1913
     
 Formula: Ca3Fe3+(AsO4)2(OH)3 · 5H2O
 Essential Elements: Arsenic, Calcium, Hydrogen, Iron, Oxygen
 All Elements in Formula: Arsenic, Calcium, Hydrogen, Iron, Oxygen
     
 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   Yukonite

     
 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.685
The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 23 No. 2 - Fall 1982, pg. 5Mineral Notes Research Reports, Yukonite
     
Images
     
Yukonite, köttigite, franklinite and calcite from Sterling Hill Mine, NJ
Yukonite (reddish-brown), köttigite (blue-gray), franklinite (black) and calcite (white) from Sterling Hill Mine, NJ. 3" x 2 1/8". From the collection of, and photo by Robert A. Boymistruk.

Yukonite, calcite and franklinite from Sterling Hill Mine, Ogdensburg, NJ
Yukonite (brown), calcite (white, tan) and franklinite (black) from Sterling Hill Mine, Ogdensburg, NJ. 2 7/8" x 1 3/4". From the collection of, and photo by Robert A. Boymistruk.






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