Tungsten disulfide (2H-WS2) crystals are extremely rare in nature and are less than 10 microns in the quartz / MoS? matrix. We are currently offering one of a kind naturally occurring WS? measures more than 1mm in size ready for exfoliation. Currently, there are no reports comparing the optical and electrical properties of naturally occurring WS? to laboratory grown WS?. Our measurements show that it displays superior quality. The crystals were measured and confirmed by x-ray diffraction (XRD), x-ray photoelectron spectroscopy, Raman, photoluminescence, and Auger electron spectroscopy techniques. For further questions and images please contact to us.