FRANKLINITE and WILLEMITE in CALCITE - Franklin, New Jersey, USA
Green SW LW fluorescent Willemite, black Franklinite crystals, and red SW / dark magenta LW fluorescent Calcite.
from Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA - Franklinite type locality
the mine is closed since 1954
Measures approximately 3 x 3 x 1.75 inch, 1 lb 1.67 oz / 76 x 51 x 44 mm, 501g
Item # A0700115
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).