SCHORL



Schorl, a sodium iron aluminum boron silicate hydroxide mineral of the tourmaline group, is rare at Sterling Hill and unknown from Franklin. The one occurrence is of a 3 cm radial spray of acicular crystals within feldspar, labeled as being from the open cut near the Noble Pit at Sterling Hill. They were verified by semi-quantitative microprobe analysis yielding SiO2 34, Al2O3 33, FeO 13, MgO 2.8, CaO <1, TiO2 1, MnO <1, Na2O 3 weight percent. (Dunn, 1995)

 Location Found: Ogdensburg
     
 
     
 Formula: Na(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
 Essential Elements: Aluminum, Boron, Hydrogen, Iron, Oxygen, Silicon, Sodium
 All Elements in Formula: Aluminum, Boron, Hydrogen, Iron, Oxygen, Silicon, Sodium
     
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered" 1524
     
     
 To find out more about this mineral at minDat's website, follow this link   Schorl

     
 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.425
The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 21, No. 1 - March 1980, pg. 8Mineral Notes Research Reports, Uvite
     
Images
     
Schorl in quartz from the Sterling Hill Mine, NJ.
Schorl (black) in quartz from the Sterling Hill Mine, NJ, field of view about 2.5 cm. Photo by WP.






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