SEPIOLITE



Sepiolite, a magnesium silicate hydroxide hydrate mineral, was reported from Franklin by Germine (1987) who noted it as a replacement of talc. The studied specimen is manganoan with 2.92 wt. % MnO and less than 0.2 wt. % each of other substituents. The specimen is a mass of talc with 0.5 to 1.0 cm depressions containing leathery masses of sepiolite of light brown color. The texture is fibrous with mats and bundles of such fibers having a layered texture inherited from the precursor talc. An extensive TEM-derived texture-description is given by Germine (1987). It has not been reported from Sterling Hill. (Dunn, 1995)

 Location Found: Franklin
     
 
 Year Discovered: 1847
     
 Formula: Mg4(Si6O15)(OH)2 · 6H2O
 Essential Elements: Hydrogen, Magnesium, Oxygen, Silicon
 All Elements in Formula: Hydrogen, Magnesium, 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   Sepiolite

     
 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.504
The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 29, No. 2 - Fall 1988, pg. 13Mineral Notes Research Reports, Sepiolite Asbestos
     
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