Transparent sphalerite(cleophane) on quartz

Small but very nice specimen, presenting completely transparent yellowish-green transparent izometric sphalerite crystal- cleophane. It crystalize on a plate of white quartz.On the surface of quartz base there are also small (arround 1 mm) cubic galena crystals. Size of specimen is 65 x 55 x 15 mm. Specimen has a cut base.