fluorescing SPHALERITE and WILLEMITE - Sterling Hill, Sussex Co., New Jersey, USA
Adamantine Sphalerite - fluorescent orange LW, weak SW, black Franklinite-Magnetite (magnetic, an exsolution of the two spinel group minerals), and green SW fluorescent Willemite exsolved in nonfluorescent Tephroite - note the very fine pattern to the Willemite fluorescence.
from Sterling Mine, Sterling Hill, Ogdensburg, Franklin Mining District, Sussex County, New Jersey, USA - Tephroite type locality
Measures approximately 2 x 2 x 1.5 inch, 5.18 oz / 51 x 51 x 38 mm, 147g
Price: 28.00 USD
Item # A0460514
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).