I am supposed to estimate the viscosity of melt in a shock by lightning setting. The target rock was seeberger sandstone and the cathode that produced the shock is made out of Cu (Exact formula CuZN39Pb3 (MS58) Material Number 2.0401). Therefore the melt spherules in the following pictures are made mostly of Cu and the melt threads of SiO2.
Looking forward to your answers!
Houssam