Orthoclase, a potassium aluminum silicate mineral of the feldspar group, is relatively rare at Franklin and unreported from Sterling Hill. Frondel (1972) mentions its occurrence as yellowish white to brownish masses in the calcium silicate units at Franklin, grading into hyalophane, which is more abundant. Little is known of its occurrence or paragenesis. (Dunn, 1995)

 Location Found: Franklin
 Formula: KAlSi3O8
 Essential Elements: Aluminum, Oxygen, Potassium, Silicon
 All Elements in Formula: Aluminum, Oxygen, Potassium, 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   Orthoclase

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.511

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.70

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 19, No. 2 - September 1978, pg. 10The Post Palache Minerals by Frank Z. Edwards - Orthoclase (small article)
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