Prehnite





 Location Found: Franklin
     
 
 Year Discovered: 1788
     
 Formula: Ca2Al2Si3O10(OH)2
 Essential Elements: Aluminum, Calcium, Hydrogen, Oxygen, Silicon
 All Elements in Formula: Aluminum, Calcium, Hydrogen, Oxygen, Silicon
     
 IMA Status: Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
     
Fluorescent Mineral Properties

 Shortwave UV light: Moderately bright orange to bluish orange to lavender-pink
     
 To find out more about this mineral at minDat's website, follow this link   Prehnite

     
 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.502

Frondel, Clifford (1972). The minerals of Franklin and Sterling Hill, a checklist. NY.: John Willey & Sons. p.71


The Picking Table References
 PT Issue and PageDescription / Comment
V. 58, No. 1 - Spring 2017, pg. 16Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 2, Richard C. Bostwick - Prehnite
View IssueV. 45, No. 1 - Spring 2004, pg. 13The Art of Fluorescent Mineral Photography, With Special Attention to the Minerals of Franklin and Sterling Hill Photographing the More Popular Franklin and Sterling Hill Fluorescent Minerals - Prehnite
View IssueV. 33, No. 2 - Fall 1992, pg. 11The Check List of Franklin-Sterling Hill Fluorescent Minerals - Prehnite (Fluorescent Info)
View IssueV. 18, No. 2 - September 1977, pg. 17The Fluorescent Minerals of Franklin and Sterling Hill, NJ by Richard C. Bostwick - Prehnite
     
Images

     
Prehnite, willemite, axinite, margarosanite, xonotlite, FranklinPrehnite, willemite, axinite, margarosanite, xonotlite, Franklin under shortwave UV Light
Prehnite, willemite, axinite, margarosanite, xonotlite, includes non-fluorescent andradite garnet and hendricksite mica, from Franklin, New Jersey. From the collection of, and photo by JVF.
Prehnite, willemite, axinite, margarosanite, xonotlite, includes non-fluorescent andradite garnet and hendricksite mica, from Franklin, New Jersey, under shortwave UV light. The prehnite fluoresces yellow-orange, willemite green, axinite red, margarosanite blue and the xonotlite purple. From the collection of, and photo by JVF.


Prehnite, xonotlite, pectolite, clinohedrite, axinite-(Mn), calcite, willemite and andradite garnet from Franklin, NJPrehnite, xonotlite, pectolite, clinohedrite, axinite-(Mn), calcite, willemite and andradite garnet from Franklin, NJ under shortwave UV Light
Prehnite, xonotlite, pectolite, clinohedrite, axinite-(Mn), calcite, willemite and andradite garnet from Franklin, NJ. 2" X 1 3/8". From the collection of Alex & Gary Kerstanski, photo by Alex Kerstanski.
Prehnite, xonotlite, pectolite, clinohedrite, axinite-(Mn), calcite, willemite and andradite garnet from Franklin, NJ under shortwave UV light. The prehnite fluoresces lavender purple, xonotlite purple-blue, pectolite orange, clinohedrite brighter orange, and the calcite red-orange, axinite-(Mn) deep red, calcite red-orange and the willemite green, the andradite is non-fluorescent. 2" X 1 3/8". From the collection of Alex & Gary Kerstanski, photo by Alex Kerstanski.







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