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

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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