fluorescent WILLEMITE, CALCITE with FRANKLINITE - Franklin Mine, New Jersey, USA
Green SW LW fluorescent Willemite, black Franklinite, and red SW / magenta LW fluorescing Calcite. Brief phosphorescence on Calcite – move lamp away quickly to observe.
from Franklin Mine, Franklin, Franklin Mining District, Sussex County, New Jersey, USA - Franklinite type location
the mine is closed since 1954
Measures approximately 3 x 2 x 1.5 inch, 13.22 oz / 76 x 51 x 38 mm, 375g
Item # A1351213
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).