Magnesiohornblende (Magnesio-hornblende), a calcium magnesium aluminum silicate hydroxide mineral of the amphibole group, has been found in several specimens from Sterling Hill; it has not been reported from Franklin. It occurs as dark green, massive material with titanite and calcite from the 1140 crosscut, on the 1500 level and as dark brown masses with calcite from the 1250 stope, 800 level. (Dunn, 1995)

 Location Found: Franklin and Ogdensburg
 Formula: ☐{Ca2}{Mg4Al}(AlSi7O22)(OH)2
 Essential Elements: Aluminum, Calcium, Hydrogen, Magnesium, Oxygen, Silicon
 All Elements in Formula: Aluminum, Calcium, Hydrogen, Magnesium, Oxygen, Silicon
 IMA Status: Approved
Fluorescent Mineral Properties

 Shortwave UV light: Greenish-blue
 To find out more about this mineral at minDat's website, follow this link   Magnesio-hornblende

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.455. 'Magnesiohornblende'

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.62. 'Hornblende'

The Picking Table References
 PT Issue and PageDescription / Comment
View IssueV. 58, No. 1 - Spring 2017, pg. 12Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 2, Richard C. Bostwick - Magnesiohornblende
View IssueV. 33, No. 2 - Fall 1992, pg. 11The Check List of Franklin-Sterling Hill Fluorescent Minerals - Magnesiohornblende (Fluorescent Info)
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