ANORTHOCLASE



Anorthoclase, a sodium potassium aluminum silicate mineral of the feldspar group, was first reported from Franklin by Palache (1935), who gave an analysis, said by Frondel et al. (1966) to be of impure material and thus not repeated here. Frondel (1972) noted that anorthoclase occurs as brownish granular masses in the calcium silicate units of the orebody and is less common than hyalophane. It has not been reported from Sterling Hill and has not been studied by [Dunn]. (Dunn, 1995)

 Location Found: Franklin
     
 Mineral Note: Anorthoclase is strictly a K-rich variety of albite.
 Year Discovered: 1885
     
 Formula: (Na,K)AlSi3O8
 Essential Elements: Aluminum, Oxygen, Silicon, Sodium
 All Elements in Formula: Aluminum, Oxygen, Potassium, Silicon, Sodium
     
 IMA Status: Intermediate member of a solid-solution series
     
     
 To find out more about this mineral at minDat's website, follow this link   Anorthoclase

     
 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.509

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.42
     
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