A rare form of Sphalerite from the New Rosewarne Mine, Gwinear, Cornwall, England. Very few specimens showing the featured spherulitic habit of Sphalerite came from this particular mine. Two spherulites of Sphalerite measuring to 1.4cm and 0.4cm diameter respectively sit presentably on the specimen. Supported by a scaffolding of crisscrossing prismatic translucent white Quartz crystals. The colour of the Sphalerite is a very deep brown to black with the typical lustre for specimens from the mine. More usual tetragonal crystals of Sphalerite have formed a druse of crystals measuring to 2mm, with grey-green Chlorite on a silvery matrix of Arsenopyrite. A rare and unusual Sphalerite from Cornwall.