FRANKLINITE-MAGNETITE, fluorescent WILLEMITE - Sterling Hill, New Jersey, USA
Green SW and LW fluorescing Willemite, black Franklinite (slightly magnetic due to small amounts of exsolved Magnetite) and red SW / dark magenta LW fluorescing Calcite.
Some areas of Willemite are weakly phosphorescent.
from Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA - Franklinite type locality
Measures approximately 3 x 3 x 1.5 inch, 1 lb 1.84 oz / 76 x 76 x 51 mm, 506g
Item # A0051218
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).