1, different in composition: flint is a natural mineral from Siberia, and its main component is a mixture of potash feldspar and other impurity minerals. Volcanic rock is a kind of glassy lava with dense pores, which is formed by the sudden cooling of magma during volcanic eruption and the rapid overflow and expansion of internal gas due to the sharp drop of pressure.
2. Different characteristics: The fiery red stone presents beautiful luster of blue, purple, red, orange and other colors, which looks like a flame burning. Volcanic rock is called pumice because it is porous and light, and can float on the water. It is characterized by high strength, heat preservation, heat insulation, sound absorption, fire prevention, acid and alkali resistance, corrosion resistance, no pollution and no radioactivity.