Location Found: Franklin
 Year Discovered: 1978
 Formula: KCa4(Si8O20)(OH,F) · 8H2O
 Essential Elements: Calcium, Hydrogen, Oxygen, Potassium, Silicon
 All Elements in Formula: Calcium, Fluorine, Hydrogen, Oxygen, Potassium, Silicon
 IMA Status: Approved
Fluorescent Mineral Properties

 Shortwave UV light: Weak white
 Additional Information: Phosphoresces weak white
 To find out more about this mineral at minDat's website, follow this link   Hydroxyapophyllite-(K)

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.497. 'Hydroxyapophyllite'

The Picking Table References
 PT Issue and PageDescription / Comment
V. 57, No. 2 - Fall 2016, pg. 20Fluorescent Minerals of Franklin and Sterling Hill, N.J., Part 1, Richard C. Bostwick - Hydroxyapophyllite-(K)
View IssueV. 33, No. 2 - Fall 1992, pg. 11The Check List of Franklin-Sterling Hill Fluorescent Minerals - Hydroxyapophyllite (Fluorescent Info)
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