HANCOCKITE and fluorescing WILLEMITE - Franklin Mine, Sussex Co., New Jersey, USA
Dark red Hancockite (Epidote-Pb) with green SW and LW fluorescent Willemite, dark brown Hendricksite mica and yellow Andradite.
ex Franklin Mineral Museum, from collection of Kurt Henning
from Franklin Mine (Parker shaft), Franklin, Franklin Mining District, Sussex County, New Jersey, USA - type locality of Hancockite and Hendricksite
Measures approximately 2 x 2 x 1.5 inch, 8.07 oz / 51 x 51 x 38 mm, 229g
this specimen is featured on mindat.org, minID: LTR-CQK
Price: 200.00 USD
Item # A0310115
To show the fluorescent response the specimen was illuminated using 6 watt 254nm (Short Wave) / 366nm (Long Wave) UVGL-58 lamp (you need a proper UV light source to observe the fluorescence, more powerful lamp = brighter response).