Stilpnomelane





 Location Found: Franklin
     
 Mineral Note: Ferrostilpnomelane is a variety of stilpnomelane noted for its being rich in ferrous iron. Ferristilpnomelane is another variety stilpnomelane. Both were used in earlier Franklin Mineral lists.
 Year Discovered: 1827
     
 Formula: (K,Ca,Na)(Fe2+,Mg,Al,Fe3+)8(Si,Al)12(O,OH)36 · nH2O
 Essential Elements: Hydrogen, Iron, Oxygen, Potassium, Silicon
 All Elements in Formula: Aluminum, Calcium, Hydrogen, Iron, Magnesium, Oxygen, Potassium, Silicon, Sodium
     
 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   Stilpnomelane

     
 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.472. 'Ferristilpnomelane, Ferrostilpnomelane'

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.78


The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 10, No. 1 - February 1969, pg. 6Mineral Notes - Bannisterite/Ganophyllite/Stilpnomelane
View IssueV. 6, No. 2 - August 1965, pg. 12Stilpnomelane
     
Images

     
Stilpnomelane, dolomite, calcite, and minor sphalerite, Taylor Road Dump, Franklin, NJ.
Stilpnomelane (green to metallic green and coppery red), dolomite (white-gray), calcite (white), and minor sphalerite, from Taylor Road Dump, Franklin, NJ. Photo by WP.


Stilpnomelane, dolomite and calcite, Taylor Road Dump, Franklin, NJ.
Stilpnomelane (coppery red and metallic green), dolomite (white-gray) and calcite (white), from Taylor Road Dump, Franklin, NJ. Photo by WP.







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