Clinohumite



Clinohumite, a magnesium silicate hydroxide mineral of the humite group, has not been found in the local marble quarries. The known occurrence of this species is in the orebody at Sterling Hill (Dunn, 1985a) where it occurs as massive brown aggregates, veins, and disseminated blebs, associated with zincite, franklinite, willemite, and abundant calcite. Some crystals have reaction rims of willemite. Another occurrence was reported by Reilly (1983) who described it from Sterling Hill drill-hole #124, at 69 feet (21 meters) from its beginning on the 340 level. This material was associated with dolomite and altered to white chlorite; microprobe analysis showed it was of near end-member composition. (Dunn, 1995)

 Location Found: Ogdensburg
     
 
 Year Discovered: 1876
     
 Formula: Mg9(SiO4)4F2
 Essential Elements: Fluorine, Magnesium, Oxygen, Silicon
 All Elements in Formula: Fluorine, 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   Clinohumite

     
 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.347


     
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