Quartzite is a hard, non-foliated metamorphic rock which was originally pure quartz sandstone. It has a smooth surface and it is acid resistant. Quartzite’s harness on Mohs scale is 7 which slightly higher than granite (6.5).
Soapstone is mainly composed talc and chlorite. Typical colours are grey, black, and green. Soapstone is extremely dense and its mineral composition makes extremely resistant to acids but scratch easily.