Re lava glazes - the mesh size of the silicon carbide can influence the effect it has, Testing Silicon Carbide Grits in Cone 6 Lava / Crater Glazes https://www.thestudiomanager.com/posts/tag/lava+glaze The horizontally-fired test tiles at an angle to show some of the texture. There is virtually no lava / crater effect with coarser grits. The finer grades of SiC are often sold for grinding/stone-tumbling, rather than pottery.  PS SiC is also used for local reduction, where the t