SW LW fluorescing WILLEMITE - Franklin Mine, Sussex Co., New Jersey, USA
Crystalline Willemite - fluorescent green under SW and LW, with black Franklinite.
the mine is closed since 1954
Measures approximately 2 x 1.5 x 1.25 inch, 9.06 oz / 51 x 38 x 32 mm, 257g
Price: 100.00 USD
Item # A0620115
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).