Tephroite





 Location Found: Franklin and Ogdensburg (Type Locality)
     
 
 Year Discovered: 1823
     
 Formula: Mn22+SiO4
 Essential Elements: Manganese, Oxygen, Silicon
 All Elements in Formula: Manganese, Oxygen, Silicon
     
 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   Tephroite

     
 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.336

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.79


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 - Tephroite
View IssueV. 2, No. 2 - September 1961, pg. 12Tephroite by Cornelius S. Hurlbut, Jr.
     
Images

     
Brown tephroite with exsolution willemite lamellae, franklinite and minor calcite from Sterling Hill Mine, NJBrown tephroite with exsolution willemite lamellae, franklinite and minor calcite from Sterling Hill Mine, NJ under shortwave UV Light
Brown tephroite with exsolution willemite lamellae, franklinite (black) and minor calcite (white) from Sterling Hill Mine, NJ. Photo by JVF.
Brown tephroite with exsolution willemite lamellae, franklinite and minor calcite from Sterling Hill Mine, NJ under shortwave UV light. The willemite fluoresces green the calcite red-orange and the tephroite and franklinite are non-fluorescent. Photo by JVF.







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