TODOROKITE



Todorokite, a manganese oxide hydrate mineral, was first reported from Sterling Hill by Frondel et al. (1960b), and it occurs at Franklin as well. Sterling Hill todorokite was crystallographically examined by Chukrov et al. (1978). There are no other physical or chemical data on local material. Local todorokite is distinctly dark brown or nearly black. Some todorokite specimens are replacements of ore in situ; others have a remarkable plumose texture that is both distinctly fibrous and leafy but highly irregular; such aggregates can be several cm in size. Sterling Hill todorokite occurs in the same assemblages as aragonite, hemimorphite, chalcophanite, birnessite, woodruffite, and Mn-oxides in the surface pits at Sterling Hill and is commonly associated with calcite, in some cases in vein assemblages. Franklin material is rare; it occurs with willemite and hemimorphite. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
     
 
 Year Discovered: 1934
     
 Formula: (Ca,K,Na,Mg,Ba,Mn)(Mn,Mg,Al)6O12 · 3H2O
 Essential Elements: Calcium, Hydrogen, Manganese, Oxygen
 All Elements in Formula: Aluminum, Barium, Calcium, Hydrogen, Magnesium, Manganese, Oxygen, Potassium, Sodium
     
 IMA Status: Approved
     
     
 To find out more about this mineral at minDat's website, follow this link   Todorokite

     
 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.605

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.80
The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 7, No. 2 - August 1966, pg. 14The Minerals of Sterling Hill 1962-65 by Frank Z. Edwards - Todorokite (small article)
View IssueV. 2, No. 1 - February 1961, pg. 7Todorokite (small article)
     
Images
     
Todorokite, brown surface coating mineral, with "plumose" flattened radiating crystalsTodorokite, brown surface coating mineral, with "plumose" flattened radiating crystals
Todorokite is the brown surface coating mineral, with "plumose" flattened radiating crystals (copper color), on calcite / willemite ore from Sterling Hill Mine. Photo by, and from the collection of JVF.
Todorokite, close up of "plumose" flattened radiating crystals (copper color), on calcite / willemite ore from Sterling Hill Mine. Photo by, and from the collection of JVF.






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